exhaust size question jdm itr 4-1


swizz977

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May 30, 2011
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109
hello i plan on swapping a b18c itr with the jdm 4-1 header
my question is should i run a 2.5 test pipe first and then the 60mm cat back or should i run the 60mm right after the header?

i plan on keeping the motor stock so what will happen if i run the 60mm right after the header? will i lose low end or top end? also what does this have to do with back pressure?
 



b16 mini

Ek9 obsession
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1997 Ek9,1996 ek4 siR, 1972 b18c4 mini
Just run the 60 mm pipe, the collector is unlikely to be a true 2.5 anyway,

This way there is no step downs in size
 




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