I bought these extractors off ebay for $133 including P&H.

I was just wondering, since they are a 2 going into 1 , what would it sound like if i cut the flange off and run em 2 into 2 so i have dual exhaust ?

I bought these extractors off ebay for $133 including P&H.

I was just wondering, since they are a 2 going into 1 , what would it sound like if i cut the flange off and run em 2 into 2 so i have dual exhaust ?


thats exactly what id do... i reckon it would sound swweeeeet

If you run the duel setup, make sure your piping isn't too big. You want a good compromise between exhaust flow and gas velocity.

Also you would need to the run a balancer pipe to even out the exhaust pulses between the pair of cylinders. Look at dual exhaust V8s, they have cross-over (AKA X-Pipe) usually before the cats before they split up again.

wow thats some bright carpet u got there...

wow thats some bright carpet u got there...

lol nah i forgot to turn the flash off.


If you run the duel setup, make sure your piping isn't too big. You want a good compromise between exhaust flow and has velocity.

Also you would need to the run a balancer pipe to even out the exhaust pulses between the pair of cylinders. Look at dual exhaust V8s, they have cross-over (AKA X-Pipe) usually before the cats before they split up again.

Maybe have 2 1.5" ?? or would that be to big ?


thats exactly what id do... i reckon it would sound swweeeeet

I hope so. I want a nice deep growling and lumpy sound :badgrin:

Well as a rough calculation, you can measure the size of the final piping of the extractors as they are, e.g: 2.5" outlet. Then just divide that by two, so two pipes of 1.25", one for each pair of cylinders.

Well as a rough calculation, you can measure the size of the final piping of the extractors as they are, e.g: 2.5" outlet. Then just divide that by two, so two pipes of 1.25", one for each pair of cylinders.
I'm afraid it's not that easy, as back pressure works off of area of the opening.
A single 2.5" outlet has just under 5 square inches.
Whereas 2 x 1.25" outlets only have just under 2.5 square inches COMBINED.
Reason being is that it's exponential.

So Gemini, you need to work out how much extra of an opening you want, or if at all.
2 x 2 inch pipes will give you approx just over 6 square inches.
The way to work it out is just pie (~3.14) times the radius of the pipe squared.

What's the size of the outlet on the extractors/stock headers?