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What to know for midpipe installation?

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Old 08-18-02, 05:17 PM
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Tony Stewart Killer.

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What to know for midpipe installation?

I have a 3 1/2 inch thick SS pipe that I want to have welded to my downpipe and to the catback.
Is there a sensor on the cat that I have to keep and put in the midpipe?
Does anyone have any instrusctions or advise for this?
I have the welder and the pipe that is all that I know so far.
any help would be great
Snook
Old 08-18-02, 07:09 PM
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Is your catback 3 1/2? I would NOT suggest welding it but getting a 3" that bolts on. There are hoses that go to the cat for the smog pump, just leave those hanging.
Old 08-18-02, 07:20 PM
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Tony Stewart Killer.

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no I dont think it is 3 1/2, thats just the only pipe that I have thats SS I do have a 3" mild steel pipe
I didn't buy this it's just a pipe and I know someone that can weld it. Why shouldn't I weld it? thanks for the info on the smog hoses.
Old 08-18-02, 07:55 PM
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Are you guys talking about that metal wire kinda thing that used to connect to the main cat. I always get people telling me somethings hanging from below your car. What the hell is that thing anyways. I looked in the shop manual and could not really tell what it was.

Mike
Old 08-18-02, 07:57 PM
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Well if you have a 3"dp, 3 1/2" mp, and 3" cb, it's not going to line up good and will have more backpressure going into the cb.

If you weld everything, you will have to take it off in one-piece or cut it.
Old 08-18-02, 07:59 PM
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Originally posted by m0t03
Are you guys talking about that metal wire kinda thing that used to connect to the main cat.
Mike
Yes, it's for the smog pump. You can take it off closer to the engine so it won't hang down so much and be noticable.
Old 08-18-02, 08:32 PM
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if you get a midpipe take off all that crap, Air Pump, ACV, metal runners, all those tubes
Old 08-18-02, 11:34 PM
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Oh, you do have an upgraded ecu RIGHT?
Old 08-18-02, 11:36 PM
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yea get a new ECU before you even think about throwing in that MP.

Mike
Old 08-19-02, 02:24 AM
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That thing hanging is a ground wire... some dummy must have forgot to connect it.
Old 08-19-02, 09:10 PM
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Tony Stewart Killer.

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yup ive done my hw
pettit unlimited boost ecu

thanks for all the tips guys.
i wonder how much rwhp ill be putting down with mild streetport, pettit ecu, intake, downpipe, midpipe, catback? those are just my hp adding mods btw....

Snook
Old 08-19-02, 09:22 PM
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my guestimate would be...

260-280rwhp @10psi
Old 08-20-02, 12:01 AM
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I would guess right over 300rwhp.
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