How could this be?
Thread Starter
Teching In
Joined: Nov 2009
Posts: 47
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How could this be? 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
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 
Thread Starter
Teching In
Joined: Nov 2009
Posts: 47
Likes: 0
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
-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
