Dual exhaust seems like too much trouble for me. I have a 305 with very minor mods.
I have a set of hookers and I want to take the easy way out by running just a y-pipe and 3" single exhaust.

The guy at the muffler shop says Im wasting my time as far as performance goes. His exact words were "Headers with a single exhaust?" "Whats the point?"

I told him the point was better flow, he looked at me like I was adding a turbo to a supercharger.


What could I expect (performance/sound)by going with a single 3" with headers versus stock.

Thanks to those that reply to my dumbass.:hail:

 

I'd find a new shop. The change in sound will largely depend on the muffler you put on there. By putting on a full exhaust you'll have an exhuast that actually flows as opposed to the stopped up stock system.

 

headers and single 3" exhaust is good up to somewhere around 350 hp

 

try 450 - 500hp. see traxion's posts on this subject

 

That is why he works in a muffler shop and not in a speed shop. Headers and a sinlge 3" pipe can support up to 350 to 400 hp at the wheels. There are plenty of LT1 and LS1 cars doing this everyday.

 

i used to work at speedtek performance in dallas, we had a shop car,a 2000 ls1 z28. the owner decided(?) to put a single 3 in system on the car......it made 670hp and 800tq to the wheels it was a stock bottom end with heads and cam and a 300hp shot.amazingly thatshort block made about
30 dyno pulls and 35 passes before it let go. the secret was ls1's have a very tight ring gap, once you get so much cylinder pressure, i just butts the ring togather and wha-lah yanks the top of the ring land off.we argued with himm forever on a 3in system on a 3700lbs 670hp car but he wouldnt budge . it made almost the same power on the dyno, but lost 3 tenths at the track.

 

Im going with the 3" single, I should get the car back later this week.

 

3" catback will be plenty of flow for you, esp if it is mandrel bent pipe.

 

Update: 3" on the way
AIR gone, Smog pump gone and cat gone. Looks like Ill need a new serp. belt.

Headers, y-pipe then straight to the muffler. Am I going to be able to hear the radio?

 

Keeps changing:

Smog pump gutted, put back on.
Hooker cat-back system ordered by shop.

 

Decided to go with Hooker Aerochamber muffler. Now I have a complete Hooker exhaust (-custom y-pipe).

Cant wait to get it back, everyone is asking what I did with the car. Custom chip goes in next.