Y-pipe Argh!!!!
Oh... I love the new setup! Woot!!
Marc
For Marc's headers I lowered the K-member to get the y-pipe onto the collector. Due to clearance issues with the design. the collector is too close to the floor, So it was very difficult to get on, and touches the bottom of the car.
I told Marc to have an exhaust shop heat the pipes at the bend of the collector and reposition it. That should fix the issues. Other than that the rest went together pretty well. The only other issues I found was that the bolt holes on the flanges were slightly off, making it harder than usual to get the last bolt in. Also the number 4 spark plug wire sits very close to the pipe. We put heat shielding on them so it should be ok.
Marc as soon as you tune out the rear O2s you will be able to feel a giant difference in performance. Glad you are happy. Pass my name on to everyone else.
We heated up the collector at the bend and bent it downwards. We also smacked on the top of the Y in that area and flattened it more. That gave enough clearance to get the heater hose in there. Otherwise the Y would be jammed up against a frame brace. We opened up the first and last bolt holes. The back bolt would not go in straight. I installed a set of MSD plug wires and they fit beautifully with plenty of room.
These headers slide up with unbelievable ease. But because of these other issues, I was lucky to do the install at a shop with a lift with experienced exhaust guys.
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I was a little concerned about melting/burning, but since so many guys recommend this, I guess it's not an issue. I'm going to keep an eye on it for a while, though.
granted I did have, what RevGTO mentioned, the rear bolts not going in right... so I just halfassed it and used a stock bolt on each of the rear sides and have had zero issues... though tightening with both an 11mm on all but two of the header bolts was slightly annoying, since the stockers are 10mm

so I'm a little surprised about the issues recently... might have just been a bent jig or whathaveyou... who knows ... mine went in like cake, well, as close to cake-like as one can expect when doing them by yourself, on jack stands, in an apartment complex parking lot and having zero prior experience with a header install on an LS1 F-Body
BTW, how do you tolerate your GMMG with the ORY? On mine the rasp is beyond horrible - like a jackhammer. I'm not even driving my car until my Hooker goes on.
BTW, how do you tolerate your GMMG with the ORY? On mine the rasp is beyond horrible - like a jackhammer. I'm not even driving my car until my Hooker goes on.
as for how we do it...
lack of options in the end.
i had two days to kill and figured if I didn't do it in one day at least I had a second day to knock it out.
Are you using band clamps? Mine sealed up great.
Sounds burly at idle ... give it anything and it's, as you say, BLAAAT = RASP.





