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exhuast??????????

Old 10-27-02, 11:56 AM
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rpv
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exhuast??????????

just wondering
i want to do my exhaust, i have 1 more track day left for the year and 1 race left. i ran the stock exhaust and i've been getting left behind at the end of the straights.
i went to a shop and they want $150 to go from the end of the stock header to the back of the car with straight pipe. could i just do this on my own with pep boys parts and it would be cheaper? my local track does not have noise restrictions. would i gain hp? i know it would be alot lighter. i don't have the money in the budget for much more this year as i'm trying to get a trailer. should i just run it like it is and wait until next year and get the header and the rest done at the same time?
any ideas?????????? what size pipe?
88 na, i do have the cone filter intake and i gues you can tell this is a road race car.
later
robert
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Old 10-27-02, 12:39 PM
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You could get sections of pipe and weld them in place of cats/mufflers. You could also gut out the cats and mufflers if you really want to save $.
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Old 10-28-02, 09:03 AM
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Don't bother taking it over the axle. Just bring it straight back from the maniold and end with a 45* turn-down before the axle. This should save the shop a lot of time and will give you a bit more power.

Over stock (w/ cats), a straight-pipe is worth a considerable amount of power. However, the car will not be streetable (too loud) without some sort of muffler.
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Old 10-28-02, 03:19 PM
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DO NOT end the pipe UNDER the car, rotaries like to throw HUGE flames out Straight pipes and can very easily light the car on fire - Run the pipe out under the right side rocker just in front of the rear wheel if you don't want to go up over the rear axel.
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Old 10-28-02, 05:46 PM
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I've seen pipes that come out and exit 45 just in front of the rear wheel, and I've seen them dump under the car... I agree about the concern about the flames, especially first gens, they seem to spew flames on deceleration.. I havaent' seen much flamage from mine however.

150$ isn't too bad if it's mandrel bent tubing, that's about what mine cost..

PaulC
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Old 10-29-02, 09:07 AM
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thanks guys
i'm pretty sure i'll try something this weekend. but what do i have to do to the port / air pump stuff if i take off the cats? i'm still not to clear on all that.
robert
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Old 10-29-02, 10:25 AM
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You wire the 6 ports open, dump the air pump, and you remove the ACV and install a blockoff plate.

You shouldn't be racing below 3800 RPM anyway.

PaulC
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