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Discussion Starter · #1 ·
Hey guys. its been a while since i've been on but i'm wondering whats the difference in exhaust pipe back pressure between the indy 440 and 500 both liquid cooled.

Do to circumstances im boring the sled out to a 500.
I've already got the head on order and the jets well be in soon just wondering if im going to have to change the exhaust to a 500 because of back pressure.

thanks for the help

NATHAN
 

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so you are boreing a 440 out to a 500? if so then no you dont need to change your pipe
 

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Discussion Starter · #3 ·
polaris91 said:
so you are boreing a 440 out to a 500? if so then no you dont need to change your pipe
ya i've bored out the sled before to 442 or something like that but i've maxed out how far i can go with the 440 head so i've ordered a 500 head. and now i'm going bigger
 
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