Stillen Headers

Z eliminator

Today the stillen exhaust and berk cats were intalled. It bolted up perfectly except that the exhaust was too close to the cross member. It just cleared it. Not wanting to stress the welds on the exhaust we put a washer under the cross member by the exhaust set up on both sides of it. No clearence problems at all now.
The headers have been sent out to be coated and the installer sees the problem coming with the allignment. He will be modifing the cats in the next few weeks.
The car sounds much better , not that much louder that before, Has a nice sound to it.
As usuall the car ran terrible driving home (ecu has to learn, it idles a little lower) .
i punched it a few times and it broke the tires free. I will run it for a week and then get it dynoed. Base 266. g3 intake 285.6, cats the exhaust ( hoping for 315.) Time will tell. It feels a lot stronger.
There appears to be a whistling niose when i punch the throttle in nutreal as the revs come down. Everthing is tight. I think that its is coming from the intake ot behind the drivers seat.
Installion reveiw intake (need lots of work)
exhaust crossmember issue
changing the diff to 4.08's ( no problems )
cobb axcess port ( pulling out what ever hair i have left on my head )
headers === ( stay tuned )
The 350 with the stillen exhaust is louder than the 370 with stillen exhaust and berk cats.
12's in the 1/4 mile here we come.

Denny McLain

Spent the afternoon yesterday at a muffler shop whom I'm friends with. Even with the washer trick, you could hear the exhaust clunk at times. Thinking it was the slip fit/clamps doing it, had them weld all of them. Before that they heated the brackets, bending them so the exhaust sits a tad higher. The muffler shop also thought the exhaust was cheesy and I still need a few washers for it to clear.

The real cure is the Y-Pipe section needs to be cut, shortened and the exhaust moved forward slightly. The diameter of the Y-pipe being close to the brace is what is causing the issue. (not really...poor fit/design) This dawned on me on the way home and I'll probably take the car back and give it another try.

Very disappointed that Stillen has not taken ownership of the issue and offered solutions.