Lost boost after exhaust Mod.
Hi guys,
something Wierd happened to my r34 GTT like the title says I've lost boost after installing a just jap bell mouth dump to cat.
Nowmy previous setup was just a blitz cat back and I saw 9psi.
Now ive installed the turbo back jjr bell mouth and gutted my cat I'm only getting 7psi.
I would of thought freeing up the exhaust would give me more boost or the same.
Can someone tell me where I've gone wrong ? Is it cause I gutted the cat?
any help would b much appreciated
thanks.