2.5in exhaust- pro's / con's
02-08-2006, 07:48 PM
#2
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2.5 Will obvously flow more than the stock pipes. It will also be able to accomidate higher overall HP.
You might lose some low end torque though, but not much. There really isn't much of a disadvantage.
Slightly worse gas milage maybe? ( like 0.5 MPG?)
You might lose some low end torque though, but not much. There really isn't much of a disadvantage.
Slightly worse gas milage maybe? ( like 0.5 MPG?)
02-08-2006, 08:33 PM
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Originally Posted by RedBaseBolt
2.5 Will obvously flow more than the stock pipes. It will also be able to accomidate higher overall HP.
You might lose some low end torque though, but not much. There really isn't much of a disadvantage.
Slightly worse gas milage maybe? ( like 0.5 MPG?)
You might lose some low end torque though, but not much. There really isn't much of a disadvantage.
Slightly worse gas milage maybe? ( like 0.5 MPG?)
02-08-2006, 08:38 PM
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to be honest, you might not even notice the difference
if you're staying N/A, on a dyno the 2.25" might make better numbers but I'm willing to bet butt dynos will show no difference.
I've had both 2.25" exhaust and 2.5" exhaust (I have 2.5" right now) and the gains were so small from the exhaust period that its hard to even tell.
Its general knowledge though that 2.25" piping is supposed to provide the optimal flow on a small NA 4 cyl engine.
I would get whatever makes you happy...
I am wondering however, how 2.5" from the header back would effect me. I plan on purchasing a header, high flow cat and I'm not too sure what my downpipe size should be.
if you're staying N/A, on a dyno the 2.25" might make better numbers but I'm willing to bet butt dynos will show no difference.
I've had both 2.25" exhaust and 2.5" exhaust (I have 2.5" right now) and the gains were so small from the exhaust period that its hard to even tell.
Its general knowledge though that 2.25" piping is supposed to provide the optimal flow on a small NA 4 cyl engine.
I would get whatever makes you happy...
I am wondering however, how 2.5" from the header back would effect me. I plan on purchasing a header, high flow cat and I'm not too sure what my downpipe size should be.
02-08-2006, 11:15 PM
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Originally Posted by MacG321
well shittier sound with 2.5 compared to the 2.25" and just depends on which company you trust.
02-09-2006, 12:19 PM
#13
I bought the DC Catback. its 2.25 i think. sounds nice and i can tell it incresed my HP as well. love it. + its stainlessteal. my stock exhaust pipe was rusted to **** allready. car isnt even 6 months old. i literly took a hack saw and did 3 motions and the pipe fell apart.
02-09-2006, 10:22 PM
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The DC is 2.5" also.... I have always found that cars 1.6-1.9 liter should stay around 2.25" and cars with larger generally do better with 2.5" just depends on the car and what future plans are... I plan on going turbo, so I am gonna do 2.5" for now!
02-10-2006, 08:04 PM
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I didnt read the entire thread. SO somebody may have told you this already. BUT backpressure is your friend. You put too big of an exhaust on your car, and you wont see any gains. 800whp big blocks run great with 3 inch pipe...so 2 and a half could possibly be overkill for your application. Just a thought.
02-11-2006, 06:40 PM
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has anyone managed to get a hold of the borla system yet?? I'm still on the waiting list @ Gravana, but the sooner I get the exhaust the sooner I put both the header and exhaust on...
02-11-2006, 11:10 PM
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Originally Posted by 68Drop
I didnt read the entire thread. SO somebody may have told you this already. BUT backpressure is your friend. You put too big of an exhaust on your car, and you wont see any gains. 800whp big blocks run great with 3 inch pipe...so 2 and a half could possibly be overkill for your application. Just a thought.
02-12-2006, 12:51 PM
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The guys that did my exhaust told me that if you are NOT getting mandrel bent pipe with 2.5" it wont fit over the rear axle that you have to do 2.25" if it is crush bent??? Is that true I went with mandrel so it really doesn't matter but has anyone else heard that with their 2.2's?
02-12-2006, 02:43 PM
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that doesn't make sense to me at all...its smaller piping so it should have more clearance by that alone. And then in the method of bending the pipe should give u a little bit more space as well since they're pushin the pipe in towards the bend.