Flowmasters not good for hp?

[kim]

Originally Posted by nuclearcobra

Hey FeetFirst i havent tryed open headers against ultra flos but the guys at the track have and they say half a tenth gain at the best with open headers over ultra flows.

Depends on cam design.... if the cam is crutched for some back pressure (restrictive exhaust) open headers might hurt.

[nuclearcobra]

Very true Kim my 76 cobra two likes a little back pressure. What did sound wild this year on my two was an open x pipe i took off the flow master 1 chambers to try it . Now i wonder if an x pipe with the ultra flos will be better on my big block stang? I guess next year maybe, first i need to try a converter leaving at 1200to 1300 rpms aint cuttin it 151.0 60' isnt bad but it gives me an idea what its gonna be like with a new one if the tires hold it.

[BigBlockFalcon]

3 1/2 race bullet's

http://videos.streetfire.net/video/a...cd018a79cb.htm

[bruno]

im going to put some single chamber flowmasters on my high comp 521 ---iused to running with open headers i will give you guys some before and after numbers ----FLO-9430109 single chamber race muffler