C7 Straightpipe problem
Thread Starter
2nd Gear
Joined: Oct 2020
Posts: 2
Likes: 0
C7 Straightpipe problem
We recently straightpiped our c7 and now it has been making this noise whenever we stay at a constant speed. If you give it a little gas it goes away but comes back shortly. Any ideas what it could be?
Le Mans Master
Joined: Dec 2001
Posts: 5,707
Likes: 555
From: St. Peters MO
C7 of Year Finalist (stock) 2019
2018 C7 of Year Finalist
Most likely it’s exhaust drone at a specific RPM. If that’s what it is most likely you will have to deal with it with no mufflers.
Melting Slicks
Joined: Oct 2009
Posts: 2,560
Likes: 485
From: Moberly, Mo
Most likely lost some power and torque. These motors need back pressure and you've eliminated that with straight pipes. Did you also go to long tubes and cat delete?
Last edited by 99vetteran; Oct 5, 2020 at 08:56 AM.
Safety Car
Joined: May 2000
Posts: 4,829
Likes: 357
From: Albuquerque NM
Less backpressure can mean less boost on a motor with a supercharger or turbos, but that doesn't mean less power, boost is just stacked up air that is being kept from the engine by backpressure or other restrictions.
Racer
Joined: May 2018
Posts: 439
Likes: 328
Straight pipe will accentuate the sound of the V4 mode for sure.
T
Burning Brakes
Joined: Feb 2019
Posts: 1,234
Likes: 416
From: San Diego
if auto, probly V4 mode, yes. look for the light to go on, on the dash, when its in that mode. if you have a stickshift, the car will NOT go into V4 unless you have the mode selector below the shifter set to eco mode. in which case youre probly hearing it drone. fix it by putting a billy boat axle-back on there, imo. it sounds the best of them all =D
i myself just had the mufflers cut out entirely and thats it, i drive like an ******* so its rare i hear it droning.
i myself just had the mufflers cut out entirely and thats it, i drive like an ******* so its rare i hear it droning.
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