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grocerygetter · 05-31-2014, 10:53 PM

1 7/8ths is plenty. At 650whp FI kooks 1 7/8ths headers only gained me 5%. No cats in either comparison.
Doing a heads cam build on my ls6 now targeting 450-470 whp (if it was an ls3 this combo would yield about 50-60whp more), keeping the 1.75 longtubes I have now for this.

05-31-2014, 10:53 PM	#11
grocerygetter instigator Drives: 2020 6.2 Trail Boss, 2022 XC90 Join Date: Jan 2010 Location: 72034 Posts: 3,979 View My Garage	1 7/8ths is plenty. At 650whp FI kooks 1 7/8ths headers only gained me 5%. No cats in either comparison. Doing a heads cam build on my ls6 now targeting 450-470 whp (if it was an ls3 this combo would yield about 50-60whp more), keeping the 1.75 longtubes I have now for this. __________________ -John S.