advised me not to install my FMIC with 2.5 inch piping

[HollywoodHalo56]

I tried searching for this and didn't quite get an answer. I was having a discussion with my friend and he advised me not to install my FMIC with 2.5 inch piping. He said that it would be too much air for my basically stock GSX (3" turbo back, MBC at 15lbs, and clutch) and that installing it could cause knock to start in my engine. I know I'm running rich right now and, until I can get an AFC setup, I figured the inter-cooler would help and I could see some gains even on this setup. Is his argument valid? He also mentioned this specifically happening in winter. Though Ohio winters can be back. Thanks for the help

 

[cheap90gsx]

Depends what you want out of your car. 2.25 fits well but the 2.5 would support more air volume.

 

[Maranello993]

its an auto x car so response is important, especially off boost since i dont spool to full boost often. I guess the question i can't answer is whether or not hunting down 2.5 inch piping is worth it in order to avoid the neck down at the BOV area.