Exhaust Gains

WIST2013GT

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Looking for some insight on where to spend money on the exhaust. The car is a Vortech v3 car on 93. Exhaust setup is: stock exhaust manifolds, JBA cat deletes, JBA 3 to 2.75 X pipe, stock OAPs, GT500 axle backs (This is how I bought it).

What gains would I see from long tubes?
What about changing to a 3x3 inch x pipe and 3 inch OAPs?

For reference, the car made 530whp on a mustang dyno as it sits.
 

DaBigBone

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Long tubes pick up a lot on boosted cars. I'd imagine somewhere in the 40+ hp range
 

gimmie11s

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You doing the work youself or having someone do it?

Id spend the money on a return fuel system, convert to e85, and a 3.33 pulley if it were me. Leave the exhaust alone.
 

PC03GT

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Unless you find a great deal on some long tubes I would follow the suggestions above. The only reason I went to headers is because I got a full kooks setup for 1000 bucks, I couldn't pass up on the opportunity. You'll make 40+hp
 

WIST2013GT

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Do you think the rest of the exhaust is a restriction? I know AED tested the OAPs on a N/A car and gained 7whp. I assume I would see more since I'm trying to move more air?
 

CobraBob

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At your power level I don't see a real need to upgrade to a 3" system or add long tubes (expensive). I agree that you'd be best off spending your money on a return fuel system, convert ing to e85, and going with a 3.33 pulley. Best bang for your buck. Down the road when you have funds to do it, you can add long tubes. JMO.
 

WIST2013GT

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E85 on the stock pulley will probably make 700whp right? I'm still a completely stock motor so I'm guessing that's going to be leaning on it pretty hard lol.
 

stangn

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Put headers on it now! My Whipple car made 640 thru stock headers, 3"
Off-road X pipe, stock OAP and GT500 mufflers. All I did was add On3 shorty headers 1-7/8 with 3" collector. Had it retuned and it jumped to 705 and I was shocked! Pump gas car. Defined back to 680 for saftey and I started using Torco.

In my case it was a huge upgrade.
 

MRSUPRA

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Put headers on it now! My Whipple car made 640 thru stock headers, 3"
Off-road X pipe, stock OAP and GT500 mufflers. All I did was add On3 shorty headers 1-7/8 with 3" collector. Had it retuned and it jumped to 705 and I was shocked! Pump gas car. Defined back to 680 for saftey and I started using Torco.

In my case it was a huge upgrade.

65hp from shorty headers sounds a little crazy. Was this done on the same dyno? Either way, 705rwhp on pump gas is hard to beat!
 

OX1

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Put headers on it now! My Whipple car made 640 thru stock headers, 3"
Off-road X pipe, stock OAP and GT500 mufflers. All I did was add On3 shorty headers 1-7/8 with 3" collector. Had it retuned and it jumped to 705 and I was shocked! Pump gas car. Defined back to 680 for saftey and I started using Torco.

In my case it was a huge upgrade.

Stock bottom end?
 

stangn

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I called BS myself on the gains but Sai assured me it was correct. Same tuner and dyno however different days. My motor is a built 5.2 by the way guess that could help. I really didn't think the crappy stock manifolds were that bad. Until you look at how there made and then compare them to how the 15 up is made. 2 cylinders dumping into the same pipe with no increase in size can't be good at elevated power. The 15 up increases the tube size after they merge 11-14 doesn't.
 

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