Hey gang,

87S4 just put in porken EZKchip and X pipeaoutbtwo weeks ago. What's the HP gain from that modification? I'm thinking of changing back to factory cat. X pipe a little loud at 2200 - 2700 rpm. Sounds great at 3000 and above.

I'm trying to figure out what I'd loose.

 

15-20 probably.

 

That may be too much to give up.

 

For 500rpm of "too loud"...... I'd say so. :-p

 

Except 2200 - 2700 rpm is highway cruising, at least for a S4 with a 2.20 rear end. An x-pipe, without cats or a rear muffler, drones pretty badly in that RPM range.

awilli6, do you have cats on that x-pipe? That will help, slightly.

Putting the S4 rear muffler back on will kill the droning, along with every other enjoyable sound. It is not a restriction issue, the stock mufflers are straight-through-- they just have too much sound-absorbent stuffing for our taste.

I think the right answer is either:
a) Some sort of real-but-sporty mufflers in place of the stock mid-resonators. This is how our GT is set up and sounds great, fairly subdued at idle and motoring sedately past the sheriff, but the most wonderful unworldly howl at wide-open throttle. Or,
b) A dual-pipe rear muffler of some sort, just enough to kill the drone. Constantine (Black Sea R&D) made some of these and we've got one on our S4. It sounds aggressive but not overly loud at idle and motoring down the highway, and louder but not nearly as loud as the GT at WOT. (But everything else is different also: displacement, cams, headers, exhaust, etc).

 

oh ya.... dur...

 

I have an xpipe, 12" cats, small resonators, and a home made 2.5" rmb. On the gas the car is loud as hell, but no droning at the cruise rpms mentioned by others.

 

I have headers, stock cats, no resonators and a Borla muffler...I like the sound of it, but I have an x-pipe that will replace the cats as soon as I figure out how best to do that (damn things are welded on and I'll need some custom fabrication...not my forte). I'm very curious how loud this will be, I actually wouldn't mind it louder with the exception of the OP's problem area...I'd prefer it not get worse at highway cruise. Which it probably will lol...

 

I am running a set of Greg's headers to a Y pipe then out a 3" single and i have a 14" magnaflow muffler where the old pumpkin muffler was, and a tip welded to the muffler , sticking out the stock location... Not loud at all.

 

You are running a Y pipe on a 16V engine. The sound is a lot different than 32V with a dual exhaust.

 

I think I'm gonna let the x pipe go. Is there any HP gain with just the porken chip? If it's just gonna eat up more gas, I may go back to stock chip also.

 

Oh for sure. When I step on it , sounds like a "lemans " car. According to my neighbors... Lol

 

Jake,

Have you had your lugs checked for wax recently? - ha ha!

Rgds

Fred

 

well, what i meant to say was no drone... LOL. thats what i get for posting and eating.

 

You sure they are not saying lemons ??