First of all the car is damn near to loud! I did the Pacesetter LTs with 3in. X pipe and two bullets...I went with the longer bullets. Anyhow, I can live with that. The problem is there is hardly any ground clearance now. I had to go under the tranny brace because I really dont know how I could have done it any other way. But wait! thats not the worse problem, the car now stumbles a bit under light acceleration, mostly around 3K rpm. Now since I just did headers most would think a plug wire is burnt. But I checked several times and all plug wires are not even close to the headers. So this leaves me with a couple questions. I did get rid of the AIR and EGR. As of right now the EGR vavle is still on the intake but the tube that would lead to the headers is blocked off. Could this be my problem? If not does it sound like my opti is just deciding to crap out now? What gives! thanks for any input

Aaron

 

one of the plugs got gapped too much or you tapped the tip and it is gapped to close? maybe not threaded in far enough?

major exhuast leak?

 

One tiny little leak where the x connects in the middle. The plugs were all gapped good. I just took it for another longer drive and got on it and now the miss/stumble seems to have almost went away. Only noticed it once. I dont know if it would have anything to do with starting it and idleing into the garage and back out a couple of times on open headers....concidering it only ran for maybe a total of 20sec. each time. Who knows, we'll see what happens I guess.

Aaron

 

Post pics of your setup.

And yes bullets will make your car retardedly loud lol.

 

Did you do the headers and exhaust all at once? I'd be looking at the o2s myself.

 

Never touched the heads, and the O2s are a good point Kmook. I put the old ones back in (have about 95K miles). I read a couple weeks back on here that the oils burning from new headers can screw up O2 sensors. I figured I would drive it a couple days, and then retorque all headers bolts and install the new O2s.

Aaron

 

Woops, meant headers.

 

There must be something with the 3" duals that makes them alot louder than 2.5". I have 2.5" and they are pretty quite while cruising and at idle.
All subjective I suppose.

 

Yes Kmook I did the headers and rest of exhaust all at once. I figure I'll drive it for a bit here and see what happens.

Aaron

 

Did you get the knock tuned. Mybe your knock sensor is reading it way too much and you are getting major knock from the lt1 knock sensor.

 

I have the LT4 KM installed. Also, I just got done taking a little road trip the the exhaust bottomed out twice when I hit a little dip in the road and the cars suspension "sunk" down a bit. I need to rip off the exhaust and start over I think, at least from the headers back. I dont know how to go about getting better ground clearance.

Aaron

 

With the 3" true duals, you're probably losing about 3/4" of ground clearance. I dont know if your clamps are facing downward, but thats about another 1/2". So right there is roughly 1 1/4" of clearance lost.

Don't rip that exhaust off, find a way to make it work.

 

Unless that mass is blown into oblivion, if not, all 55.

 

Actually I only have clamps around the headers, everything else I welded up. I may end up ripping this all off and going to 2in. or 2.5in. We'll see what happens. Thanks all.

Aaron

 

i have an LT4 KM and still get 7* knock.