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Old 10-13-2007, 09:10 PM   #1 (permalink)
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Default header and 2" exhaust

i have a 1988 suzuki samurai which i am going to upgrade the normal stuff plugs,cap,wires,etc.my question is if i put a header and 2" exhaust system will this hurt or help my performance i know a lot of people do this but i noticed most are running aftermarket carbs such as webers.were i am running a factory carb any help would be appreciated thanks
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Old 10-14-2007, 01:59 AM   #2 (permalink)
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I have a 1985 Holden Drover (Sierra) with headers and 2" exhaust and I'm still running the original carby with no problems. With the larger exhaust the engine breathes a lot easier and you can rev the motor longer and harder. I'm regularly revving the motor up to 7000 rpm. I could never do that with the original exhaust.

I suggest doing a compression test before changing the exhaust. If any of the pistons show less than 100psi I recommend that you fit new piston rings before fitting the new exhaust. Fitting a performance exhaust on a tired engine will only suck more power out of the motor.

I rebuilt my motor after 400k and now it goes like a bat out of hell and I'm still using the original carby. One of the downfalls of the aftermarket carbies is they suffer from fuel starvation on steep hills and in serious off road conditions.

If you're not happy with your original carby try overhauling it, overhaul kits are available. If you're not confident doing the job yourself take the carby to a carby workshop and let the pros overhaul it. Hope this helps.
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Old 10-17-2007, 07:21 AM   #3 (permalink)
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i am thinking of putting extractors and 2.5" exhaust on my vitara, do you think 2.5" exhaust is too big, my dad wants to put a Y divider after the extractors to make twin exhaust, what do you think.

How much did it cost u to get port and polished
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