3 inch vs 2.5 inch exhaust question

My 69 road runner has been sporting a TTI complete long tube header system with 3 inch pipes connecting H-pipe into DynoMax mufflers and out the back for about 5 years.

Since i lowered the car the exhaust system rubbs pretty much all the time and it was just plain aluminized pipe so it's looking pretty bad now.

I was thinking of going to a 2.5 stainless system with their X-pipe and was wondering if anything will change for the better or worse with smaller diameter pipes??

The engine is the original 383 still in there.

Any thoughts on what i might see differnt in performance if i go for the smaller pipes?

you prob won't notice much change,except it will be quieter.
A stock engine may even run better as it will keep the exhaust hotter and move better.
I wouldn't go to a 3" unless you plan to hot rod the engine.

Unless you are over the 500hp level, I bet you won't see a loss in performance. I asked a similar question years ago before I chose for my Duster.

Might even run better - a stock 383 should only need 2 1/2 duals with a crossover. The 3" might have actually been too large to scavenge properly.

The new system will be a nice package w/ a sotck or near stock engine. I had a low-po 383 that did very well w/ HP manifolds, 2.5 pipes, X pipe, and Magnaflows. Exhaust was 2.5 all the way to the bumper.

raise the car back up!
scavaging is done in the first 12" of the header from the header flange at the head.
2 1/2 will be fine but that's a nice system on there now!

Quote:

---

raise the car back up!

---

No way man, low and slow is the way to go!



Ok so it's likes i may just go back to the 2.5 and try to find the stainless sttel pipes as myu car sits outside all the time and it's getting to look pretty rusty now.