63mm vs. 65mm exhaust.. Need opinions

2mm isn't gonna make a difference in anything IMO. 2mm is like less than 1/10 of an inch.

ohh really.. hmmn. i was thinking of either getting the 65mm comptech or 63mm t1r.. I already have bcrh and injen cai..

:edit:
reason why i ask is because i know the bcrh is about 65mm at the end i was thinking if i mate it with another 65 it would help up high end but i read the bigger the id on the exhaust you lose torque correct?

I thought the t1r bottlenecks down to an even smaller daimeter.:dontknow: Don't quote me on that though, but look into it.

i dunno.. i read earlyer while researching that t1r dosent bottle neck

i was i/rbc/rh/e/kpro before. and imo since your in the market for an exhaust. go with the 65mm and do it right the 1st time:thumbsup:

but if you already have the 63mm, just stay with that imo:bow:

65mm, why pair up a 65mm header to something with a smaller ID?

:iamwiths:

rEDlinEDc5 said:

i was i/rbc/rh/e/kpro before. and imo since your in the market for an exhaust. go with the 65mm and do it right the 1st time:thumbsup:

but if you already have the 63mm, just stay with that imo:bow:

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:iamwiths:

firemanG said:

i dunno.. i read earlyer while researching that t1r dosent bottle neck

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im pretty sure the comptech does too...these something you have to grind down..

GO T1R!!!!!!!!!!!

kuz i has it

and you'll love it haha

CPU said:

I thought the t1r bottlenecks down to an even smaller daimeter.:dontknow: Don't quote me on that though, but look into it.

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nope:thumbsup:

i measured mine

its true all the way through

rEDlinEDc5 said:

i was i/rbc/rh/e/kpro before. and imo since your in the market for an exhaust. go with the 65mm and do it right the 1st time:thumbsup:

but if you already have the 63mm, just stay with that imo:bow:

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yeah I guess I'll go with your advice :thumbsup:

I have read that comptech does bottleneck and even the bcrh as well. Ya gotta grind them down to see their true ID..

I'm strongly considering the T1R Power 70R. JDM blind and I can get it for a good price. :thumbsup:

firemanG said:

yeah I guess I'll go with your advice :thumbsup:

I have read that comptech does bottleneck and even the bcrh as well. Ya gotta grind them down to see their true ID..

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Any ideas to why they would bottleneck them?

unigrain said:

Any ideas to why they would bottleneck them?

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Usually it's at the flanges, so in this case, it's simply sloppy manufacturing.

intake/header/3 inch exhaust!

firemanG said:

yeah I guess I'll go with your advice :thumbsup:

I have read that comptech does bottleneck and even the bcrh as well. Ya gotta grind them down to see their true ID..

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glad i can help:beerchug:

but since were both in CA. just be careful running a 65mm exhaust, especially with a rh. since it will be loud, and i bet you know as well as i do, CALI COPS:thumbsdow:deadhorse

just go with the 63mm exhaust like it says up on the post 2mm is not going to make a difference

rsxtypes0818 said:

just go with the 63mm exhaust like it says up on the post 2mm is not going to make a difference

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The difference between a 63mm and 65mm Exhaust is 6.5% in diameter, add that to the length of the exhaust and maybe it adds up, :dontknow:
Go 3" and be done with it. We all end up wanting to go there eventually.