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Hello im looking for a little bit of advice.... i have a ported standard manifold and a stainless steel manifold which i got off ebay.

When i looked at the stainless one the diameter of the runners are greater than the exhaust output on the cyclinder head, so would this not cause lag in throttle response and decrease in torque?

So hence my confusion about which manifold to use??

Cheers in advance Troy

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when you say stainless steel one off ebay i hope you haven't gone and got yourself an autoFAIL autobanh mani?

if it's a Jperformance then you will be fine mate, if you happen to have got the autofail mani i would just bin it.

the slightly larger diameter pipe work wont have any effect bud as the less restrictive design will make up the flow

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sorry to hijack bud but I have an autobahn mani and is seriously cracked. I need new stainless mani just to last a while. are the ones off ebay that are 3mm ok?

Hello yes thats the one that i have got not yet fitted it, so cant quote how long it will last but i also got a braced decat which been told helps it last.

The quality of the welds and the wall thickness is alot better than the autobahn one though hope that helps

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i made the misstake of gettin a cheap one of ebay that was supposed to have 3mm thick runners thinking it should be ok if its 3mm. once i got it i checked thickness with a micrometer and it was 1.3mm not 3mm. got straight on tinternet nd got a refund.

they agreed to refund me straight away without question as if they knew that theyd sent me the thin monkey metal shit and was hoping i wouldnt check.

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i made the misstake of gettin a cheap one of ebay that was supposed to have 3mm thick runners thinking it should be ok if its 3mm. once i got it i checked thickness with a micrometer and it was 1.3mm not 3mm. got straight on tinternet nd got a refund.

they agreed to refund me straight away without question as if they knew that theyd sent me the thin monkey metal shit and was hoping i wouldnt check.

also it even said on the listing "3mm thick not 1.3" which is the reason why i checked it because it sounded dodgy

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