its a bigger bore than my other scorpion exhaust as i went to use this system with my other backbox and it had no chance of fitting.

I used it on my car and it ran 24psi through it on my 2.1zvh forged pistons, steel rods, omex management, T35 etc etc and sounded awsome!!! def a nice exhaust! and in very good condition compared to most u see for sale