Those of you with a Hogan catless DP please read
Those of you with a Hogan catless DP please read Hey anybody out there with a catless DP notice what can best be described as a tinny ticking or chirping sound at medium to hard acceleration ? im noticing this sound and its driving me nuts... i checked for leaks... there are none... it sounds almost like acoustic resonance of the exhaust pulses in the DP... just wanted to see if anyone else out there is in the same boat... Thanks
The only time I heard any ticking was when it had a leak. Turns out the nut gauld up on the stud, it appeared tight so I figured it was. After ~100 miles or so I had to figure out what the trouble was. Had to replace the nut and stud, that was a pain in the ***.
wrap it Just a suggestion. Try wrapping the down pipe with one of the many available heat wraps, like the ones used on headers. Should insulate that sound. It would also keep the heat in the pipe, out of the floorboards and keep exhaust velocity up (hotter air in pipe = increased velocity = good)
On The Tree
Joined: Feb 2008
Posts: 153
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I've had this sound with both my current DP and the one on my GTP. I think it is fairly common and I believe it is resonance in the pipe as well as some noise from the flex-pipe which is also considered normal. The ticking noise never bugged me enough because, to me, the performance upgrade makes up for the annoyance.
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Just a suggestion. Try wrapping the down pipe with one of the many available heat wraps, like the ones used on headers. Should insulate that sound. It would also keep the heat in the pipe, out of the floorboards and keep exhaust velocity up (hotter air in pipe = increased velocity = good)
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Launching!
Joined: Jun 2009
Posts: 223
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From: Bury St Edmunds, England
I get a tick like that on my GT. It has a Hogan DP 3in-2.5 with a highflow cat. I think its a leak and im to lazy to fix it. But alot of peeps on Clubgp forum say it needs to be header wrapped and it will quiet down.....
hmm... thanks for all the input... im going to put it on a lift at my friends shop this weekend and wrap the hell out of that pipe... we'll see what happens... i spoke with Kurt from Hogan and he said hes heard of something like that before... he mentioned that over time these DP's will develop a "patina" over the surface and the the patina itself will insulate the sound... but im going to wrap it anyway... that sound drives me INSANE !!
I've actually sent mine back to Hogan and he reports no leaks.I have a catted DP right now, but just bought a catless one to replace it. I should have the catted one for sale soon.
i was just wondering instead of buying the catless one why not cut off the cat and put a piece of pipe in its place?
Mine is modular also, just don't have a straight through pipe. I purchased the catless because I was under the impression that the catted Hogan I have is leaking because of the same noise the OP posted.
ok i was just wondering.
Do you guys realize that the stock downpipe is double walled from the manifold to the cat. That is why it is about 2.25 inches diamater in the inside. GM did not build the stock downpipe for performance at all. You go to a 3" single wall that has a little thinner steel and now you have noise. This is why wrapping it with header wrap quiets the noise down.
