Sup guys I'm debating whether to redo my catback on my car.
Purchased kiddracings header so Im getting a new high flow cat put in that's 2.5" diameter. My catback currently is a greddy ti-c and is 60mm piping which is around 2.1"?

I was thinking of getting a piping kit from vrs and putting my own resonator and muffler.

Do you guys think the cost/time is worth it? Will the gain be noticeable?

The setup is just a stock b16a2.itr cams,intake,header

 

I would do it. If you have a tuning system you should get a decent gain from it.

 

Yeah I was going to get an ecu and tune but I wasn't happy with my parts list.wanna make sure if I get it tuned that I have the parts that'll make the most power on my budget ya know?

I'm just wondering if .4 of an inch is even gonna make a difference lol

 

It will with tuning since it's nearly half an inch. Getting a tuning system first gives you something to build on.