Race pipe

Pete_89T2 · 02-22-2011, 10:11 AM

None of the race pipes or resonators on the market will have a place to attach the split air pipe - no cat, so you don't need it.

If minimal emissions modification is what you're after, you can just rig something up to secure the now hanging split air pipe under your car, and let it vent to atmosphere. This won't hurt anything, but the air exiting it may sound funky...

If you notice on your Air Control Valve (ACV), it has an "exhaust" port where it dumps low pressure air from the pump to whenever the ECU isn't directing the air to the cat and/or exhaust ports. That ACV exhaust port has rubber plumbing and a plastic muffler on it, which silences the sound this ACV exhaust would otherwise make. If you remove the rubber plumbing & muffler piece from the ACV, it sounds sort of like a flattulent cow. You might have the same sound problem if you open air vent your split air pipe -- never tried it, but it stands to reason. Guess you can try, and see if the sound is noticable over the engine exhaust.

02-22-2011, 10:11 AM	#3
Pete_89T2 Lifetime Rotorhead Join Date: Apr 2010 Location: Elkton, MD Posts: 874 Rep Power: 16	None of the race pipes or resonators on the market will have a place to attach the split air pipe - no cat, so you don't need it. If minimal emissions modification is what you're after, you can just rig something up to secure the now hanging split air pipe under your car, and let it vent to atmosphere. This won't hurt anything, but the air exiting it may sound funky... If you notice on your Air Control Valve (ACV), it has an "exhaust" port where it dumps low pressure air from the pump to whenever the ECU isn't directing the air to the cat and/or exhaust ports. That ACV exhaust port has rubber plumbing and a plastic muffler on it, which silences the sound this ACV exhaust would otherwise make. If you remove the rubber plumbing & muffler piece from the ACV, it sounds sort of like a flattulent cow. You might have the same sound problem if you open air vent your split air pipe -- never tried it, but it stands to reason. Guess you can try, and see if the sound is noticable over the engine exhaust.