Ask you guys what the best pipe size would be for a 305 TPI motor. At first I wanted a 3" system but now I'm thinking more on the lines of 2/12 or 2/34 pipe. What do you guys suggest? I'm doing a Y-Pipe setup on my GTA and just wanted to know what you guys thought. Also, suggestions for headers? Fitment issues? What about a cat, whats my best buy with this? Thanks in advance

 

3" system is the way to go. Your car already has a 2.5 (if not 2.75") system already.

 

i have 3" true dual and i must say... it prolly helps the 305 breathe much easier. many ppl bang our motor for power but i find that it pulls hard with my set up. i also have hooker super comp headers, flowmaster 40s

 

:BS:

First of all..3 Inch dual Exhaust on a 305 is totally idiotic.Your car is puking out its intestines! You are losing power not gaining anything.

 

well i must say.... mr i have a v6, my puny 305 has beaten another 3rd gen with a v6, or maybe a 305. heres the deal, he revs on me, him and his girlfriend in his car me and 4 passengers in mine. we go he pulls ahead a lil, then i tromp him. never saw it coming.

i cant vouche for dynoed power of my car but trsut me, i havent lost to anything smaller than a 350

 

3 inch exhaust is plenty big for a 305 but dual 3 inch?!??

Christ,ive seen dual 2.5 inch on a 87 monte ss but still not as big as yours.I guarantee your losing power.

 

well the amount of exhasut gasses that leave the tip of mt pipes at idle doesnt say to me that im using to big of a pipe

 

Single 3" is great for that car. Dual 3" is too much for a 305. 3" duals is losing power on that small of a motor. Unless you are pushing 500 fwhp 3" is losing power. If you must run duals on a 5.0 car use 2 1/4 or 2 1/2 inch pipe. Single exhaust run 3" and there are plenty of aftermarket companies that offer setups like this for very affordable prices.

 

Exactly, Dual 3 Inch is totally rediculas for a 5.0!

 

Agreed.


I bet you would be quite pleased if you downsized a bit. Heck, 450rwhp LS1 cars only run a single 3".

 

well it was on the car when i bout it.... and itll stay on till i get teh exhasut redone for my 350.. im hoping for 450 or more hp

 

I wasn't actually asking about a dual 3" system. I was refering to a Y-Pipe system. Was thinking about getting the Hooker aerochamber. So 3" is too big? I was told that it would be overkill for a 305.

 

3" single exhaust is great for that car. Thats what Im running and it has all kinds of power. There is just no use for 3" true dual exhaust on a 305.

 

I see...

My buddy has a '90 IROC with a factory dual exhaust with chambered mufflers. How much would that cost?

 

He has the dual cat option. A single 3" cat back can be had for $250.