lnlycrpr

i agree. its the same process. i used to swap B and H series motors in hondas all the time. I found this to be much easier b/c when you keep the same series, its simple plug and play. it bolts right in w/o modification and RWD is easier to swap than FWD in my opinion. since you used to work on VW's i couldnt see it being any harder.

your "friend" was about to rip you off, so i wouldnt consider him a good one... if one at all. $1500 will get you an entire 13BT swap and it's well worth the money spent.

phoenix7

please, someone correct me if I'm wrong:
VDI= variable Dynamic Intake. the 5th and 6th ports open up at higher RPMs (as eric stated, like Vtec) along with the secondary injectors kicking in. Some people have disabled it and have WIRED their 5th and 6th port open (loss of hp/tq at lower RPMs). I don't think it applies to S4s though. There ARE some threads out there on how to MODIFY your S4 with S5 Intake but i've never looked into it.

I know some people have problems because their 5th and 6th ports don't open after they removed the cats but again I'm not too familiar with the S4 so the S4 guys will be able to clarify this for you.

As far as which exhaust is better? It's all up to you and what your needs are. If you live in a place that has emmissions/lots of cops/old people/or a billion riceres revving at you because your car is loud then I would MOST DEFINITELY recommend the Racing Beat collected header manifold-back exhaust.

If you don't have to worry about any of the issues above then get any open exhaust (dual or single does not matter except that the duals supposedly lower NOISE emissions) but remember the NA LOUD with open pipes. It sounds great for the first 15 minutes. Any longer than that and you're going to need earplugs, unless you've already tried to turn the car on with only a header, in that case you're already the happiest deaf person in the area.

WhiteBoyzRacing

yeah i removed 1precat and the main and left only 1of the pre cats. i like the dual because it looks nice and with only a single like im running now doesnt look all that great with the xtra hole in the bumper lol, thanks again bro

jarred

I've swapped an s5 longblock/tanny into my s4 gxl and it was a pita to iron out all the wiring gremlins and I don't suggest anyone do it. The only reason iI did it is because I had a steal of a deal on the rebuilt engine/new clutch/harness. I also run a full 2.5 straight through exhaust (header/no cats/magnaflow can) with no problems from cops but maybe its different in Canada.

ericgrau

iTrader: (1)

So you have a precat but no main? I'm confused, I thought there was only one of each. I'd do a search to learn how to check your 5th and 6th ports just in case. I think you just smear some white grease in the right spot and see if it gets rubbed off when you rev over 4000 rpm.

WhiteBoyzRacing

there was 2 pre cats and 1 main cat. I removed 1pre cat and the main cat.

--[]-[]--[]------------ it lookd like that lol

phoenix7

for future reference:

S4s have 3 cats
S5s have 2 cats

anything new?

ericgrau

iTrader: (1)

ohhhhh, that explains it. Learn something new every day. Wait, didn't he say he had an 87? That's s4. If he has an s5 the the 5th & 6th are opening via air pump and WhiteBoyzRacing has nothing to worry about. If it's an s4 or if he doesn't know he should check them to be sure.

gear_grinder

iTrader: (4)

HANG ON, the aux ports in a NA car are nothing like v-tech other then the fact that it adds more power at higher RPMs. the aux ports just open to let more air/fuel mixture into the engine, v-tech changes the valve timing and angles while running to extract more power. thats Y a v-tech cam looks so weird compaird to "normal" ones.

Aaron Cake

iTrader: (1)

Actually, the aux ports are almost exactly like V-Tech. V-Tech changes the valve timings, the aux ports change the port timings. Same difference. In the case of the aux port system, the 5th and 6th ports greatly delay port closing when open.