Generation IV External Engine - 650 Hp headers- What size pipe?

What size engine pipes and twin exhaust would you need for a motor that puts out 650Hp N/A at the crankshaft? Cheers Russ

1 7/8 to to 3in

What size engine pipes and twin exhaust would you need for a motor that puts out 650Hp N/A at the crankshaft? Cheers Russ

i use 2in arh to 3.5 collectors to 4in over the axle mufflex with magnaflo muffler.made 658hp on superflo dyno.

I am buying the Trickflow 225cc CNC ported 65cc comb. chamber heads. These heads flow 259cfm on the exhaust at .600 lift. I have found a graph on the net under David Vizards exhaust article and according to this graph it is something like 2 1/8" primary. Then because I am running 8 psi boost the pipes could even go bigger. My ls2 is still 364 cubes. Does anyone have any other thoughts on this? Cheers Russ

I am buying the Trickflow 225cc CNC ported 65cc comb. chamber heads. These heads flow 259cfm on the exhaust at .600 lift. I have found a graph on the net under David Vizards exhaust article and according to this graph it is something like 2 1/8" primary. Then because I am running 8 psi boost the pipes could even go bigger. My ls2 is still 364 cubes. Does anyone have any other thoughts on this? Cheers Russ

for your combo 1 7/8 with 3in collecters sounds real good imo.

Tals7, thank you for your help. What about with the FI - could I go to 2" primaries to let the flow out? Cheers Russ

Tals7, thank you for your help. What about with the FI - could I go to 2" primaries to let the flow out? Cheers Russ

You could, but I think 1 7/8 will be plenty.

Go 2" and be done with it. i've got 2" Kooks on my 454 and it's NA. a boosted 364 will move the same or more air than my 454, the more pipe you have, the better. i would AT LEAST go 1 7/8" stepped to 2" witha 3.5" collector, but that's just me. the car would still run fine with 1 7/8" x 3", but i'd go bigger.

My 440 will have KOOKS D-Port 2" to 3.5"

We used to run a 2000+hp outlaw car (400ci w/F3R blower) and ran 1 7/8 headers...

Tals7, thank you for your help. What about with the FI - could I go to 2" primaries to let the flow out? Cheers Russ

you could use 2in headers but might lose a little down low with small cubes.when we dyno tested my motor we tryed stock ls7,1/34,1/78,2in headers mine just liked the 2in ones.i will tell you there was not a huge diff between them all.i made 653hp on the stock ls7 quads.

Thers two ways to go 1 7/8 stepped 2.0inch or strait 2.0 inch in my past stepped headers make more tork....and tork is king..

Thanks fellas for all the info. It gives me something to ponder over. cheers Russ

I using Kooks D-shaped 1-7/8"-3" in my Ls2..Nice sound

1 7/8 to 3 is sufficient. i am going 1 7/8 to 2 stepped to 3 1/2 then to 4 inch y to four inch mufflex system.