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Thread: 4k exhaust

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    Default 4k exhaust


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    ok so i went to the muffler place to get my straight pipe. i wanted 1.75 but he only had 2 inch. me not thinking said ok. car has no torque bit pissed off. going back there tomorrow to swap the pipe for smaller and i was wondering. will 1.5 inch be alright? or will i still loose torque? will it be better than 2 inch? what sizes do people suggest for just a standard 4k
    thanks

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    Veteran bigm's Avatar
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    i used a 2inch exhaust on my stock 4k with extractors.
    i found an increase in perfomance, well to me it did

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    i kept the front resonator and just freed up the rear section. Was loud enough and kept if not made a bit more power.

    hope this helps

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    add a muffler

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    it was just guttless. like no torque at all. struggled to get up a hell that i normalliy go up in 3rd in 2nd!!! gonna change it to 1.5 tomorrow. see how that goes. maybs muffler. will see

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    yea i forgot to add
    mine was 2 inch from extractors with 1 resinator.
    1.5 would be to small IMO, very close to stock

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    On one of my ke's I had extractors to 1.75 straight through with a fucked muffler at the back and it was noticable increase over standard

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    maybs my problem is no muffler

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    Quote Originally Posted by scott_22 View Post
    maybs my problem is no muffler
    Combination of both.

    2" pipe with a muffler will give good results.

    You need -some- backpressure.
    You can have any brew you want... as long as it's a Datsun / Corolla / What is that?

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    Exhaust flow is not about back pressure, its all about temp and air speed.

    The bigger the pipe the slower the air speed, thats why you see twin systems instead of a single 5" exhaust.

    You have to work out what size pipe is best for your engine, i have no experience with 4K exhausts so I can't comment.

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