Z1 High Flow Cats review
 

I bought a set of Z1 HFC used of someone, the fitment was great the sound is amazing and i have it paired with a muffler delete. Its loud but it screams at wot there is a slight hiss from time to time. I didnt use the z1 gaskets because I was told they are trash. Highway drone isnt that bad. The guy who help me install it had testpipes with muffler delete and I didnt like the rasp this is definitely the way to go if you want testpipes deep sound without rasp and smell.

Which gaskets did you use

Honestly I am not sure the seller threw it in with the cats

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I would not recommend installing the Z1 exhaust gaskets as before I have had to take my exhaust apart to replace the Z1 exhaust gaskets because I had an exhaust leak due to their gaskets. I use red rtv and gaskets I have used FI,AAM,Berk,PPE,Motordyne etc. they all have worked well. You may have an exhaust leak? You should have a exhaust shop you trust diagnose your Z to see if you have an exhaust leak if you can’t do it yourself. Exhaust leaks are best diagnosed in person.

What makes you think I have a leak, I didnt use the z1 gaskets

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The hiss is normal for VQ motors. It might be because you mentioned it.

I figured

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