moddedta

I had my car tuned a couple months ago and put down 428hp on a mustang dyno. I went to the show at carlisle this weekend. They had a dynojet, I believe it was a 248. So i was expecting around 450hp on this dyno. After the runs were done I had a max of 365hp and 322tq What the hell is up with that? The only thing that was changed was the y pipe. My other one was shot, so I had one made. The garage made me a 2.5" crush bent pipe. It looks and probably flows like ****, but could it really cost me this much hp? My afr was also around 12.7 to 13.0 through the run. I would really appreciate some input

sujomatt

iTrader: (7)

Why would you pay for a 2.5" crushed y pipe

And what are your mods, etc.. And where are you located?

moddedta

I am located in barnesville, pa. I have:

-slp longtube headers with slp off road y pipe
-Hooker aero chamber catback
-Electric cutout
-Trans Am K&N FIPK Cold Air intake
-7.400 trickflow hardened pushrods
-ls6 243 heads P&P with a 5 point valve job specs below
- NEW surface mill to 62cc (15 Ra)
- Valve job inspected and touched off, exhaust valves back cut to enhance flow
- NEW Patriot 'gold' springs set up @ 1.750" (135# seat/ 365# Open)
-Ported LS6 Intake
-Smooth bellows
-Forged Mahle pistons
-Hellfire Rings
-Ported LS6 oil pump
-Comp cam Lifters
-Walboro 255 fuel pump
- ford 42lb green top injectors
-ls2 timing chain
-comp cams custom ground 234,236 110+4 lsa camshaft

sujomatt

iTrader: (7)

Are you running an Auto? Locked/unlocked? etc?

moddedta

6 speed. like i said, the ONLY thing different is the y-pipe. I just can see losing that much hp from it

sujomatt

iTrader: (7)

Well if you went from a nice flowing 3" y pipe to a bent 2.5" ... its like running a 2" pipe really... so yea, i'd say it's dominating your setup pretty well.

moddedta

damn, well needless to say, that pipe is going right in the dumpster. anyone have a decent y pipe for sale?