[dzrtrat1111]

what is the best dual exhaust size for sound and performance on a stock (for now) 302?

[EagleAutosports]

Hiya, I see this is your first post. Welcome to the site.
For a stock 302, you could go as small as 2 1/4 but go with 2 1/2 for the best breathing and sound.

[dzrtrat1111]

thank you, that's kinda what i had thought, but wasn't sure, bought a 65 last month. it has dual flowmasters on it and 2" pipes, that just didn't seem big enough to me so i thought i would ask.. thank you again!

[heavy metal]

welcome!i agree,2.5 inch pipe would be great.add a set of 3 inch tips for a deeper sound.

[302THEBOSS]

2 or 2 1/4 for best performance unless it makes alot of high end power

[5.0 in a 66]

2.5"..no real loss, more availabilty of parts if you want to get funky with it later, and plenty of room to grow in HP.

[Cobra6]

I put 2.5" H-pipe dual exhaust on my stock '65 GT coupe (289-4V A code) with turbo mufflers and it seems about right. Good throaty rumble up to about 50 MPH, then it quietens out. I stil have the stock exhaust manifolds on the engine.

[Hipogt]

2.25" should be fine, unless you intend to build for way over 300HP, then I would go w/2.5". I believe hi-po's came w/only 2" stock. More important is to use a H or X pipe for better low and mid range torque, mandrel bent tubing, and a quality low restriction muffler.