DROES99STANG

I know with a X you get more Horses then with a H pipe, but do you lose any Hp with a o/r H pipe? I just want a nice deep rumble. How much HP should I expect with a 4.6 SOHC BBK CAI, Flowmaster Cat Back (american thunder)

99blackout

u should gain somewhere around 5 HP with an o/r h

DROES99STANG

ok thanks for your help that is all I need to know

monkeydude3

oh yes you GAIN. You loose a bit from idle to about 2000 rpm, but beyond there it pulls much harder....

DROES99STANG

thanks for the help guys

2000GT4.6

You should not be loosing horsepower anywhere with any aftermarket midpipe, X or H.

It is said that a X pipe will make more horsepower up top, while a H will make more power down low, but I have never seen any evidence of this. Pick the midpipe that sounds the best to you, and the horsepower differences between them will be small enough you will not care.

BTW, I have seen gains around 10 WHP with a o/r X/H on a bolton 4.6 before. The extra scavanging they provide really helps make horsepower above just the larger diameter pipe.

DROES99STANG

thanks that was some very helpful information

monkeydude3

maybe it's just in my imagination that it looses it down low...

but it totally does open up the engine and let it breath... i have a video incoming right now

II 98 GT II

I've got the BBk CAI with flowmaster 40's. Sounds great:-)