What kind of performance improvement Can I expect after a cat back exhaust?

BIG, Moderate or little gains in acceleration?

 

moderate.

 

moderate, but with a cat-delete, it gets a little greater

 

less than 10 hp...depends a bit on which one you choose.

 

i just put the HKS carbon-ti on last weekend, it's all i have so far. What do you peeps think i gained from that only?

 

Finally my Ralliart exhaust arrived from Japan. Next week I will install at Mitsubishi dealer.
I will post my impressions as soon as possible.
Inside Ralliart web site they claim 10hp and 0,6Kgfm of torque.
Pictures coming...

 

I have Greddy TI Titanium, I got 13 hp gains and 9 tq.

 

send it back and get a turbo back