Originally Posted by jng2985
jerseyjoe and myself both had After cat JBA H pipe installed, both of us had base line dyno pulls and after install pulls.
Difference's
Mine - blk 13 brembo, drop in K&N filter, borla S, resonators deleted.
Joe's- grabber blue 14, roush AB's
Pulls were done on a mustang dyno.
Best 5th gear pull for me before install was 346lbs and 357hp...After install and damn near 20 degrees hotter I ended up loosing 10lbs and 9hp..? temp? 
Joe can chime in and post his number and graphs..
best of the first 3 pulls
after install
before
after
Hard to hear any difference in the video's but it did clean up the exhaust slightly, but other than that same old sound..
joes
before
after
I also did 2 1/4 pulls and before Joe posts the awesome video of the second one.. The first run was 13.1
so yes they're slow |
Hey buddy I had to figure this out the hard way on my 96 Cobra, H pipes actually give up about 6-10 whp over X pipes. They just don't flow as well, I decided the exhaust tone was what I wanted so I sacrificed the hp for the H pipe. If you want to see better number cat deletes and an X pipe would do it.