what size headers?

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Apr 2, 2010 | 05:05 PM

gr8one99SS

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what size headers?

i have a forged 370 with ported 243s around 11.7 to 1 compression that will see 150 to 250 sot of juice. Are 1 3/4 ok or will 1 7/8 be better. i will have ory and gmmg catback? looking for best performance. thanks

Apr 2, 2010 | 05:39 PM

brian_rs/ss

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1 7/8 for sure, also with that small diameter of an exhaust i would run dual cut outs for the track. or drop the coin on a 4" mufflex system and FM merge.

Apr 2, 2010 | 09:55 PM

gr8one99SS

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want to get arh headers and y pipe. was debating a 4in outlet ae y with cutout then taper to 3in to connect gmmg. cutout for track

Apr 2, 2010 | 09:58 PM

brian_rs/ss

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^yeah that should suffice. and should sound awesome.

Apr 2, 2010 | 09:58 PM

LS6427

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Won't you lose a bunch of N/A torque with 1 7/8"? I would say 1 3/4" with cut out right after the merge.

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Apr 2, 2010 | 10:07 PM

brian_rs/ss

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^no...he is running slightly bigger cubes, more compression, and a shot. the bigger diameter headers and i-pipe will shift the power/torque curve up higher, especially when the cut out is open. when closed the GMMG cb should increase exhaust velocity and shift some power and torque back down low for street driving.