Basically, since it's been on the car for a few months I just followed the pattern left by the exhaust. I can tell you that on my application (not quite a bolt up for any exhaust), one side was a straight cut (ie, ~1/8 inch cut all the way around). The other side was cut with about 1/4 inch off of one side & nothing off the other side. Hope this makes sense.

I'd say mount it, then mark along the flange with a permanent marker so you know where NOT to cut.

I used a dremel & 5-6 cut-off wheels, then smoothed the edges with a carbide bit.

quote:

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Originally posted by 93PONY:

Sawson:
Boost retard is set to 0. Timing at 5 w/octane boost....till I get the dyno tune.
Fuel: Dual Walbro 255's, one in-tank, one in-line. Stock fuel lines & rails, 36lber's, FP at 39 & running a little rich.

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You have the best possible intank combo I know of, but I dunno about those 36's. I remember Byron tuning two (if I remember right) Incon cars when they first came out, and he complained that the 36's couldn't keep up with the power the TT kit made. One was a ported stock heads and intake and I forget the cam combo. Made over 500 rwhp when the fuel was sorted out! Your heads and intake probably flow comprable that combo. As far as your car running rich, it may be rich at part throttle, but its really the air fuel ratio after 4,000 RPM that can get you in trouble... and you really need a wide band for that as I'm sure you know. Tune it very safe to 450 rwhp for those '93 pistons and live a clean long happy life at 120 mph I still haven't seen a teal cobra glow like that.

ps- I dunno about that initial timing/boost retard setup you got going there. Doesn't seem right.

[ March 19, 2002: Message edited by: st5150 ]

When I swapped to longtubes and a better off-road H (same mufflers as before) I noted a solid 1mph or ~8rwhp gain. I'm wondering if part of that wasn't just the crappy H-pipe.

I never did 'seal' the O2 tube that was supposed to connect to the air pump/smog pump thingy either.

quote:

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Originally posted by shade-tree:
interesting. I had a pace-setter off-road H with the factory headers.

When I swapped to longtubes and a better off-road H (same mufflers as before) I noted a solid 1mph or ~8rwhp gain. I'm wondering if part of that wasn't just the crappy H-pipe.

I never did 'seal' the O2 tube that was supposed to connect to the air pump/smog pump thingy either.

ah well. who cares!

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quote:

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Originally posted by 5.0Brian:

What was the better h-pipe that you switched to? Also, what type of "sealing" did you have to do to the air tube? I'm gonna have fun getting my factory H off because my car used to be a Wiconsin car (= bolts and stuff kinda rusted stuck).

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I switched to MAC 1 5/8" longtubes with matching 'shorty' off-road H. The longtubes have fat 3" collectors which step down to 2.5" in the H-pipe. There is no provision for an 'air tube' like the Pace-setter off-road H.

These are the headers I'm running now. On the pacesetter, I just left the air-tube bung hanging open and it caused a lot of noise and an interesting exhaust leak too. I imagine it hurt power somewhat. That and if the pacesetter really was necked down to like 2" or so (it probably was).

The MAC's I have have a big-ass 3" collector from the 1 5/8" primaries. Pretty cool.