is this not right? new mech says it should suck not spit, not getting any fumes or air out of the exhaust. When he was depressing the relief valve? it compression sounded alot better, he said i had a plugged catlic converter? what are your thoughts

also my state dont check emissions, so i could go with a straight pipe to the muffler.

 

Yes, you should gut the cat. i makes a very good bit of difference.