what size piping for custom cat back

[madwilly240]

I'm thinking of getting flowmaster 60 muffler for my s14, and custom cat back piping. I just dont know what size piping to get. I went low-mid end gains. Is bigger piping for more top end? Any help is appreciated. thanks

[thelinja]

If you're running a normally aspirated engine, I wouldn't go with a diameter any larger than 2.5". High end power will increase, and you will lose some low-end torque.

[boosteds14]

ya a 2.5" manderal bend will be perfect. 3" is you plan on turbo

[HaLo]

I'd say between 2.25" and 2.5" on a NA car. Mandrel bent of course. Over that, it's too much.