Please, Someone here could send to me a dyno chart with before and after a cat back system?

I talked with a Mitsubishi employee and he told me to forget to mod my car because it is almost impossible to improve the power with just bolt-ons like a cat back system.
I think that a cat back can give alone at least 10whp, Am I wrong?

Please I need a graph to prove that he is wrong


Thanks

 

He is stuopid yes a cat back will improve hp. If you have a dp and cat delete or high flow cat it will help even more.

 

Just bolt on a downpipe, testpipe, catback and get a mail dynoflash and go back and give that moron a ride in your new found power.