pulling a stock build 440 out of the challenger
will be putting in a nice 426 hemi (alum head,alum rod,590/600 solid roller,tunnel ram,2 inch headers)
car has a 2 1/2 inch 3 chamber flowmaster system now
will that be enuff or do i need to step up to 3 inch(will still be flowmasters)

Thats a lot of motor for 2 1/2" exhaust. Definately should step up to 3". Might want to concider 3 1/2 from the headers to an x-pipe and then come out of the x-pipe with 3".

Min is really 3"....And I have an X pipe in 3" if interested. Heck I run 3" on my 360!

Quote:

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2 inch headers

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i run 4" in on my hemi with no tail pipes. still picks up a tenth and a half when you pull them off. if you have 3 1/2 collectors i'd run 3 1/2 in exhaust.

No, I had Flowmaster 40s with turn downs at the axle on my Dart when it had the 340 in it. On back to back runs it slowed .2 in the 1/8.

I run 3-1/2" Ultra Flows on my 528 Hemi. A 4" system probably wouldn't hurt either. Dave

I wouldn`t put "choke masters" on anything if they were given to me unless they were the race series then MAYBE. Throw some bullets on that puppy and let it breathe.

2.5" exhaust for a modified Hemi??? That baby's gotta breathe! 3" minimum..and like Fred thinks..2" headers will be restricting that motor. Sounds like you need to re-think your whole exhaust system...if you want it to be efficient,and make the power that it should. Best of Luck with it!

i like the echo sound of the flowmasters
i fig the motor might make 600hp (pump gas)
i dont know if their 2 inch headers but do know their NOT 2 1/4
havent measured the collectors to see what size they are yet
i hate magnaflows and i wont take anything from hooker if you gave to me
iv learned my lesson with their junk headers
gonna call tommarow and see what size pipe the muffler shop can bend
not gonna be able to bend real big over the rear so prob will have to exit like old system did t/a style (rember challenger)

There easily changed. The ones I have had taper. I have cut a few 2.5" Flow Master and made them 3" sized inlets/outlets..
About a 10 minute fix with a Mig. The mufflers them selves are the same.

well it gonna be 3" as no shop around here can bend anything bigger
if ever take it to the track will just have to un cork it
lol not that its gonna hook up anyway with the lil tires on back

There is another option that you can take, order some 180 degree 3.5 inch mandrel bends and some 3.5 inch straight pipe and have a system cut and welded on your car