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Thread: Exhaust issue
04-04-2010, 06:38 PM #1
My truck was misfiring for a while and I recently got a tune up which cured the misfire. I was listening to my truck the last while and kinda thought my idle sounded kinda low, I have dual Flow Pro mufflers and it should hae been more of a rumble than I was getting. It was really bugging me today so I fired it up and went to look under to see if there was any rattling in the cats and as soon as I got under I got a blst of exhaust and some tears in my face. The gasket where the flange from the Y pipe met the OEM muffler is shot (new mufflers are a ways back).
Obviously this has to be fixed asap but I'm wondering what exactly to do. I was checking the cats because I was wondering if running it too long with the misfire wrecked them and have been thinking of high flow anyhow. If I go with swapping out the cats do they have to be in the original position? Can I just get the flanges cut off and weld pipe in its place? Or if I stick with stock cats for now is that an expensive job to fix up, was wondering if they have to drop the Y pipe to get the new gasket in and fasten properly. If the repair of the original stuff is too expensive I'll just get them t swap out the cats and make whatever modifications necessary I guess. Thanks in advance for any input/suggestions. Happy Easter all
1997 GMC Sierra SLT
Debadged/demolded, Billet Grille, JBA s/s shorty headers, Magnaflow true duals, Magnaflow cats, K & N FIPK, Stainless nerf bars, Drop Center bumper, RCX 4" lift, XD Hoss Black, 33" DC Mud Country, Bushwacker flares, Black Bear tuned
04-04-2010, 10:27 PM #2
Unbolt the Y-pipe where the bad gasket is and put a new one there. And for your cats, if their bad, cut them off and put a pipe in there place. Your truck will thank you with more fuel milage and performance. No cat is way better than even a high-flow cat.1995 Silverado,Z71, 3-inch lift,2-inch leveling kit, SkyJacker Suspension, short ram-air intake, throttle body spacer, MSD ignition coil, straight pipes
04-05-2010, 12:09 PM #3
Last edited by Okimaw; 04-19-2010 at 05:23 PM.
04-05-2010, 12:17 PM #4
Welding it up does sound like a good idea and should work. Good Luck.
04-05-2010, 12:22 PM #5
04-06-2010, 11:27 AM #6
Went to the shop yesterday and they said the flanges cant be welded but would replace the gasket for 65-70 part and labour which is a good deal. I wonder how much power and mpg I been losing with that gasket rotted out like that?
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