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I have 4 inch exhaust on my car right now and I have three catback systems. One 4 inch, one 3 inch for local authorities, and one 4.5 inch drag pipe for the track. On my current set up dropping from the 4 inch pipe down to the 3 inch pipe and changing nothing else dropped 2.3 psi of boost and...

I did 640 rwhp with the ignition breaking up at 29 psi with my SP67GT with a .81 a/r turbine housing and a p trim wheel. I installed an HKS DLI which got the ignition fixed and ran 32 psi on the street. I made 604 rwhp at 26 psi with the same turbo and a .68 a/r housing on it and 525 rwhp at 19...

http://www.dxdracingclutches.com/home.html Might also look into these guys. I have a friend with a high horsepower MKIV using there stage 4 street clutch with no issues. Sean

I talked with Eagle the other day inquiring about what horsepower levels they felt their rods would hold. The Tech informed me that they were rated for 1500 hp and had been tested in a 7M to 900 hp repeatedly with no issues. I'm guessing this was done on an engine dyno, but he never clarified...

Funny, I was having this conversation with someone last night. Again, good job Duane. Sean

Congrats Duane! You and Ron did a great job on everything. To everyone else who had a part in it great job as well. Sean

Agreed! I dyno plenty of cars with manifolds like this, a friend of mine builds them, and they have always made good power. As Dave also stated for the thickness of material you can build a heavy duty manifold relatively inexpensively. Plus you can get the el's and tee's in stainless. Sean

Agreed and the issue this time I believe was a hasty repair made by the dumbass building the car.:biglaugh: Sean

I agree about the bending instead of welding, but I didn't have anyone around who could bend three sides that tight. They could have bent up two sides but I still would have had too weld the back and front in. I have been thinking about bending some up some 1 inch angle and capping the welds...

I'm hoping that when I turn the boost controller on that this will help alittle with spool up also. I have the rev limit set at 7500 rpm but after 6500 rpm the car was still going rich so it was breaking up. The last pull before the manifold cracked it did make 7000 rpm but I was more worried...

Boost pressure killed the manifold this time. In the shop when it backfired happened a month ago. I welded it back together on the car and it broke on the dyno on the opposite side. I should have taken the manifold off the car and welded every seam over and perhaps braced the manifold some more...

First run it wouldn't even make it past 5100 rpm and it made 299 rwhp/299 rwtq, second run it made to 5300 rpm and it made 354/354. I started with a map that from what I understand is that Jason S. from AEM came up with for a speed density MKIV running 1000 cc injectors and a GT42 turbo and a 5...

Yes, it is still the stock block and head.

Here is the dyno sheet and you can see the work that needs to be done on the a/f's. Sean

These were done yesterday on a friends camera. Things went well for the most part. I had an issue awhile back with an improper calibration that I entered in my AEM. When I got it straightened out I had some fuel laying in the intake that ignited and backfired violently blowing the intake apart...

Sean

Most of the MKIV guys seem to go to 3 Wal-bro's over 1000 rwhp from what I have seen. The industry standard on the Supraforums for years seemed to be twin Wal-bro pumps. Dave Henry ran them for awhile and even had one fail on the dyno. I think he managed 603 rwhp on one Wal-bro before it went...

here is the after picture

here is a drawing of before and after.