Fd with Half Bridgeport, looking to quiet exhaust
#1
Fd with Half Bridgeport, looking to quiet exhaust
Hey guys, as the title states. Let me know what you guys are running for muffler and presilencer. 3.5inch. It's a half bridge with sxe366. The car is new to me. Thank you all in advance.
Thank you,
Jose Nieves
Thank you,
Jose Nieves
#4
Ban Peak
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I just went through this and bought an XR-1 mid muffler after trying a different catback. https://www.borla.com/products/xr-1-raceline-400371
This is THE solution as other resonators are more prone to being blown out prematurely, it quiets down the car significantly at idle but still screams and is free flowing at high RPM. It's a straight through design with perforated tubes for sound deadening, there are no plate baffles.
Did you buy the car from Justin?
This is THE solution as other resonators are more prone to being blown out prematurely, it quiets down the car significantly at idle but still screams and is free flowing at high RPM. It's a straight through design with perforated tubes for sound deadening, there are no plate baffles.
Did you buy the car from Justin?
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gracer7-rx7 (08-20-24)
#5
I just went through this and bought an XR-1 mid muffler after trying a different catback. https://www.borla.com/products/xr-1-raceline-400371
This is THE solution as other resonators are more prone to being blown out prematurely, it quiets down the car significantly at idle but still screams and is free flowing at high RPM. It's a straight through design with perforated tubes for sound deadening, there are no plate baffles.
Did you buy the car from Justin?
This is THE solution as other resonators are more prone to being blown out prematurely, it quiets down the car significantly at idle but still screams and is free flowing at high RPM. It's a straight through design with perforated tubes for sound deadening, there are no plate baffles.
Did you buy the car from Justin?
I just took notice that these are rotary specific mufflers now! My last bout with xr1 was 15 years ago where they had a v shaped divider inside.
I also need 3.5 inch, I didn't find the rotary specific borland xr1 in that size
Last edited by jsnow82; 08-15-24 at 10:54 AM.
#6
Senior Member
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SP Mufflers out of Australia makes great stuff.
https://spmufflers.com.au
Their resonators and rear muffler are some of the biggest and quietest that will fit under an FD. I have them on my semi peripheral port, bridge ported 13B with a 3.5" exhaust that I am finishing up.
https://spmufflers.com.au
Their resonators and rear muffler are some of the biggest and quietest that will fit under an FD. I have them on my semi peripheral port, bridge ported 13B with a 3.5" exhaust that I am finishing up.
#7
Ban Peak
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I did, how did you know? Are you familiar with Justin and the car? I have ran the borla xr1 in the past and it has loud
I just took notice that these are rotary specific mufflers now! My last bout with xr1 was 15 years ago where they had a v shaped divider inside.
I also need 3.5 inch, I didn't find the rotary specific borland xr1 in that size
I just took notice that these are rotary specific mufflers now! My last bout with xr1 was 15 years ago where they had a v shaped divider inside.
I also need 3.5 inch, I didn't find the rotary specific borland xr1 in that size
The rotary XR-1 only has a 3" in/out option, I don't think you'll be losing anything to reduce to 3" for the mid muffler, especially if you are open WG. If you want to see pics of what it looks like looking through shoot me a PM.
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#8
SP Mufflers out of Australia makes great stuff.
https://spmufflers.com.au
Their resonators and rear muffler are some of the biggest and quietest that will fit under an FD. I have them on my semi peripheral port, bridge ported 13B with a 3.5" exhaust that I am finishing up.
https://spmufflers.com.au
Their resonators and rear muffler are some of the biggest and quietest that will fit under an FD. I have them on my semi peripheral port, bridge ported 13B with a 3.5" exhaust that I am finishing up.
W
How much did they cost you shipped to the USA?
#9
I met him last year after I found out he moved into my neighborhood, he sold the car because he was moving and right before he left I helped him with his caddy.
The rotary XR-1 only has a 3" in/out option, I don't think you'll be losing anything to reduce to 3" for the mid muffler, especially if you are open WG. If you want to see pics of what it looks like looking through shoot me a PM.
The rotary XR-1 only has a 3" in/out option, I don't think you'll be losing anything to reduce to 3" for the mid muffler, especially if you are open WG. If you want to see pics of what it looks like looking through shoot me a PM.
I'm sure someone on this forum has for high boost.
I'm also wondering about the Racing Beat Universal mufflers........
Last edited by jsnow82; 08-15-24 at 12:58 PM.
#11
I'm 4" all the way from the turbo back with recirculated wastegates. I'm using a 2 Burns Stainless race mufflers that are 4" in and out as resonators. 1 12" just off the DP and 1 17" at the end of the mid pipe. Sounds very reasonable. Quality is excellent of course and they are completely rebuildable. They now have a "Quite" version of there race mufflers. Pretty much every piping diameter you can think of as well as different overall diameters as well.
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peejay (08-17-24)
#12
I'm 4" all the way from the turbo back with recirculated wastegates. I'm using a 2 Burns Stainless race mufflers that are 4" in and out as resonators. 1 12" just off the DP and 1 17" at the end of the mid pipe. Sounds very reasonable. Quality is excellent of course and they are completely rebuildable. They now have a "Quite" version of there race mufflers. Pretty much every piping diameter you can think of as well as different overall diameters as well.
Did you use a 3-4" expander off of the turbo hotside?
#13
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#14
That looks great!
I do not have any dyno videos of this setup. Here are some photos. They would be better if the car was on a lift but this is the best I have. Off the turbine it's a 4.21" Marmon V-Band Turbine Outlet Flange to 4" tube adapter. I'm using a normal Vibrant 4" inlet muffler at the rear.
![](https://drive.google.com/thumbnail?id=1I2cM8oR5RjlkbP-L6H-68S_skJUQiqaQ&sz=w1200)
![](https://drive.google.com/thumbnail?id=1RA0RePmho76D8_u20SDHGdkIpTeehcmy&sz=w1200)
![](https://drive.google.com/thumbnail?id=1q7gfhU7wV-l1lXffoUyrPoARYS9NotUE&sz=w1200)
![](https://drive.google.com/thumbnail?id=1ETlgzWRt7Zwtymi4u-Z6GUfp49BW1xDD&sz=w1200)
![](https://drive.google.com/thumbnail?id=11dYKm79rdaPTg8s1v5-wzVb3r48lXTPM&sz=w1200)
#15
Thanks, I may be hitting the dyno in a few weeks. I'll try to get a video for you so you can hear the sound. In my opinion sound at idle and cruising at high speed on the freeway are the most important areas for sound. Idle because I'm old and my neighbors/family get annoyed. Freeway because a heavy loud drone annoys me!
I'm definitely going to switch to the burns quite version next time I get some fab work done, just to see the difference.
I'm definitely going to switch to the burns quite version next time I get some fab work done, just to see the difference.
#16
Thanks, I may be hitting the dyno in a few weeks. I'll try to get a video for you so you can hear the sound. In my opinion sound at idle and cruising at high speed on the freeway are the most important areas for sound. Idle because I'm old and my neighbors/family get annoyed. Freeway because a heavy loud drone annoys me!
I'm definitely going to switch to the burns quite version next time I get some fab work done, just to see the difference.
I'm definitely going to switch to the burns quite version next time I get some fab work done, just to see the difference.
And I am going to message you about your build. I am shooting for similar HP as yours. Would like to chat about your setup.
#17
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I think we have the same S366 turbo. Do you have a photo of your hotside? I thought that even with a 1.0 A/R housing the outlet was limited to 3"? I thought I Was pushing it going from 3" to 3.5". Would love to see how you got to 4.21".
And I am going to message you about your build. I am shooting for similar HP as yours. Would like to chat about your setup.
And I am going to message you about your build. I am shooting for similar HP as yours. Would like to chat about your setup.
I believe this is the adapter my fab guy used. https://agpturbo.com/4-21-marmon-v-b...3-5-or-4-tube/
#18
Senior Member
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#19
I’d be reluctant to run the quiet version on a rotary, you’re flowing 30% more exhaust gases per HP than a piston engine and as they openly admit, a 500 hp LS V8 loses 25 hp with a pair of them. Coupled with a BP or PP intake setup being less tolerant of emap (if you have that). The only justification in my mind is if you’re on a track with a strict low sound limit and you’re coming up a dB or two short.
I believe Coast Fabrication in Costa Mesa was the originator of those mufflers but not sure if they’re still in business any more.
.
I believe Coast Fabrication in Costa Mesa was the originator of those mufflers but not sure if they’re still in business any more.
.
Last edited by TeamRX8; 08-18-24 at 08:52 AM.
#20
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I’d be reluctant to run the quiet version on a rotary, you’re flowing 30% more exhaust gases per HP than a piston engine and as they openly admit, a 500 hp LS V8 loses 25 hp with a pair of them. Coupled with a BP or PP intake setup being less tolerant of emap (if you have that). The only justification in my mind is if you’re on a track with a strict low sound limit and you’re coming up a dB or two short.
I believe Coast Fabrication in Costa Mesa was the originator of those mufflers but not sure if they’re still in business any more.
.
I believe Coast Fabrication in Costa Mesa was the originator of those mufflers but not sure if they’re still in business any more.
.
the JDM tuners were more like 3 CFM per HP
CFM per Sq inch of pipe is about 115
so for 500hp you need either a 3.5" or 4" diameter
#22
I’d be reluctant to run the quiet version on a rotary, you’re flowing 30% more exhaust gases per HP than a piston engine and as they openly admit, a 500 hp LS V8 loses 25 hp with a pair of them. Coupled with a BP or PP intake setup being less tolerant of emap (if you have that). The only justification in my mind is if you’re on a track with a strict low sound limit and you’re coming up a dB or two short.
I believe Coast Fabrication in Costa Mesa was the originator of those mufflers but not sure if they’re still in business any more.
.
I believe Coast Fabrication in Costa Mesa was the originator of those mufflers but not sure if they’re still in business any more.
.
I have tried a few combination of these 3.5" setups. One common thing about all these is the nice tone, no matter how loud they are. They really quiet down some of the annoying frequencies. I did not dyno each iteration so not sure how much power was lost utilizing the 2-stage mufflers. End of the day, this is all a compromise.
-1x single 2-stage quiet muffler in the rear. Too loud for me.
-1x single stage under the car, 1x single stage at rear. Better, but still wanted to quiet it down.
-1x single stage under the car, 1x 2-stage at the rear. MUCH much quieter with the best tone.
I've even considered adding another single stage to the setup however after swapping in a metallic cat for street usage, this was the sweet spot. Use the cat on the street, swap in the single stage for track usage. Expensive, however cry once and get it done: https://www.rx7club.com/market/1158570
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j9fd3s (08-18-24)
#23
Rotor or no motor
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I have always like the oval magnaflow mufflers and they are pretty quiet but i just switched to the oval borla xr1 and they are even better and very reasonably priced
i went from 3.5” to 4” and the car is reasonably quiet…
i have a resonated oval midpipe with the xr1 and currently the magnaflow 3.5” oval as my tailpipe but i will be switching to the 4” oval xr1 as my tailpipe. I am happy with it
i went from 3.5” to 4” and the car is reasonably quiet…
i have a resonated oval midpipe with the xr1 and currently the magnaflow 3.5” oval as my tailpipe but i will be switching to the 4” oval xr1 as my tailpipe. I am happy with it