I have the stock sequential twins, stock precat, stock cat, stock intake. Has anyone ran a cat back straight pipe with this?

I ask because I just autocrossed a friend's fd rx7 with an aftermarket DP and an aftermarket exhaust and it was too quiet for my tastes. Although I have been looking for a ti exhaust, I'm worried it will be too quiet.

 

By cat back and straight pipe, I assume you mean a full turboback exhaust with no cats? If so, these cars make a ton of beautiful loud noises! I have an Apexi N1 with some downpipe that makes it 3" from the turbos to the tail pipe and it is very loud even at idle.


Video for reference. It was taken with a phone but I assure you that it will be loud enough for you without the cats.

 

Be careful if you are running a stock ECU. Check the FAQ's for "boost creap" for more info on that.

 

I think he means a straight pipe from the cat to tail.

If u want noise, and a bit of engineering, the apexi n1 duals are a pretty loud catback. They do have mufflers though, so..

 

Correct. Straight pipe Only from stock cat to tail.

 

I'm running stock twins, dp, high flow cat, and blitz nur spec exhaust. It's Nice and deep at idle, LOUD at 2000-6000, and VERY LOUD (in a good way) above 6000. Going from a stock cat to a high flow cat didn't increase the volume by much.

Just pick a loud exhaust like the nur spec or apexi n1 and your car will be louder.

 

Recommend removing the pre cat immediately. They can/will fail and plug your main cat which can damage the engine. They're also a source of a lot of underhood heat that can be avoided with a good downpipe that's been wrapped or heat coated. No catback muffler and you'll get attention but it may not be the kind you like. Personally I don't think it would sound very good.

 

When I replaced my stock exhaust with a blitz nur spec (stock DP and cat) my **** was LOUD. Like I'm setting off car alarms on parking lot loud

 

I have the stock sequential twins, stock precat, stock cat, stock intake. Has anyone ran a cat back straight pipe with this?

Yes, that is how my stock class FD was set-up when I bought it. I didn't like the missing muffler look and the fact that the hangers weren't well done so the exhaust pipe would flop all over.

Also, with the straight pipe from the cat it made diesel truck like turbo sounds (whistles, gurgles, burps) which didn't sound very sports car like.

I put a Ebay OBX-R cat back on it which looked and sounded great and then later a Magnaflow Ti cat back on it to lose some weight. The Magnaflow Ti sounded nothing like the straight pipe, but it didn't sound as good as the bigger pipe/muffler OBXR cat either.



-Edit- Not able to embed the Magnaflow Ti exhaust vids from FB I guess.

 

Thanks for all the replies.
I previously used a cat back "straight pipe" on my previous autox stock cars, an old rx8 and my 996.
I grew tired of it quickly as these cars were also my DD.
In contrast, the Mugen exhaust on my old S2000 autocross car was great.

I was hoping that the twin turbo of the rx7 would quiet a straight pipe down some to make it more palatable.
After listening to those clips, I think its still too loud.

So I just bought a JIC Ti exhaust. Here's to hoping its not as quiet as I fear.
Thanks!

 

The older I get the more quiet I want my car. (go figure) I used to have a Apexi GT spec exhaust with a midpipe and that was making me go deaf haha.

Post some vidss of the JIC ti

 

Speaking of being old and quiet(er)...just moved from GReddy SP to RB dual tip. Gave just a little up at WOT but loving the lack of drone at cruising.

 

I also have the Rb duals. It's a great sounding exhaust but on the heavy side. I may sell it one day

 

I hefted both and not more than a pound or two difference between it and the SP. Not sure how it would compare to others. Not enough to be important for a streeted car IMO and I could stand to lose a couple lbs anyway.

 

Well, Ti exhausts typically have a tinny and raspy sound.
My Magnaflow Ti (same as Greddy Ti) sure did.

A big exhaust cannister on a Ti exhaust might help take the tinny raspy notes out, but it will be even more quiet.

Which version of the JIC Ti did you get (round or oval cannister)?

I am curious what you think of it once its on!

 

I currently have a Greddy Power Extreme Ti catback, HFC, and downpipe on my stock twin, stockport setup, it's semi loud to me but I am thinking about changing it up. I'm thinking about either finding a Ti midpipe or bumping up to a 4" Ti midpipe and N1 style catback. I must note that I just bought a single turbo kit so I won't be on the stock twins much longer. Will going to a 4" system be more beneficial for a big single turbo setup and will it be too loud?

 

I have a HKS downpipe, custom midpipe, and Apexi GT Spec axle back exhaust. if you are ever in the area you can swing by and ill take you for a ride.

I'm located on the south side, Palos Heights / Tinley Park area.
Mike

 

Get a st mays shotgun. Best one. I have tried several. Not too loud but definitely deeper than most. And looks great.

 

I don't believe those are easily sourced Matty. You were lucky and bought your FD with all of the nice rare expensive parts already sourced and installed

 

I'm running a Apexi N1 Titan and it's pretty deep sounding at idle. It does drone at highway speed though.

I use to run the setup you specifically mention. When I bought my car it was from a guy that autocrossed every now and then. Car was definitely louder but sounded mean back then.

 

Can't remember for certain, but didn't the St May's require some modification trimming of the rear valance?

 

Yes that's why I bought it. The knightsport double tube down pipe is pretty darn cool too. Someone asked me the other day if it was 20b given the deeper tone of the setup.

I am thinking about getting the pipes jet coated. Anyone ever do this to a CB? Any drawbacks? I am just looking to add some durability. Any thoughts?

In terms of trimming required...I am not sure. Car has a diffuser on it. Maybe rich knows....I think they did most of the work on car.

 

^IRP absolutely did almost all of the work on Hetrick's FD---- we built it and I spent lots of time porting his engine. He was a gov't/military/badass and he spent money on all the right mods

I wouldn't coat the catback. It's furthest downstream and won't benefit much. Durability? The metal will survive indefinitely. Only reason to do it would be for aesthetics, example my brother had his Apex'i GT spec ceramic coated in black to look sinister

 

Ok ty. I was afraid of it rusting. I do notice some surface rust on the pipes heading to the canisters. I am speaking about coating the pipes between the midpipe and the canisters. I will take a pic.

 

will the Apexi power fc ecu automatically stop Boost creep?