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Anyone has 70MM Dual Exhaust with Resonated TP?

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Old 03-05-2009, 04:36 PM
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Thumbs up Anyone has 70MM Dual Exhaust with Resonated TP?

I currently have T1R 70R Sparrow exhaust with regular TP. I'm thinking of putting a 70MM resonated TP in there because I heard it reduces the loudness. I'm wondering if anyone out there is running a 70mm dual exhaust (any brand) with resonated TP?

It'll be best if you had experienced both sound so you can tell the difference. Also does anyone know where 70MM Resonated TP can be purchased? I've only seen 63mm resonated ones.

Thanks.
Old 03-06-2009, 09:57 AM
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No luck?
Old 03-06-2009, 12:36 PM
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did you find a 70mm resonated tp? when i was looking, i only found t1r 63mm resonated test pipe. i bought it and it combined with my berk header, which is 63mm anyways, and my asura 3" dual exhaust, sounds AWESOME!
Old 03-06-2009, 08:22 PM
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i have the invidia v4 with test pipe. 70mm duel that makes NO NOISE!! the most quiet 70mm exhaust on the market by far!! and shows good gains
Old 03-06-2009, 09:56 PM
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Originally Posted by camuman,Mar 6 2009, 01:36 PM
did you find a 70mm resonated tp? when i was looking, i only found t1r 63mm resonated test pipe. i bought it and it combined with my berk header, which is 63mm anyways, and my asura 3" dual exhaust, sounds AWESOME!
Your exhaust diameter is 3 inches? I believe that's even longer than 70mm. So you are running a testpipe with smaller diameter than your exhaust?

I've always thought that TP diameter should be either equal or bigger than exhaust diameter.
Old 03-07-2009, 07:17 AM
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Originally Posted by Vik2000,Mar 6 2009, 10:56 PM
I've always thought that TP diameter should be either equal or bigger than exhaust diameter.
Ideally, yes they should be the same size. However, you can get away with having a smaller diameter TP than the exhaust. What you dont want is a larger TP flowing into a smaller exhaust. (Bottle necking is bad). Don't do it!
Old 03-07-2009, 12:37 PM
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So with my 70mm exhaust, it should be fine that I use 63mm resonated tp?
Old 03-08-2009, 03:06 AM
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never heard of anyone running a 70mm resonated tp to reduce loudness, interested to see how big of an impact it makes.

but. can someone explain... why.. it is said quite frequently that you should match a 70mm exhaust with a 70mm test pipe while having a stock header? the diameter of the stock header collector is only 50mm or so. to me it makes more sense to change the diameter gradually, from 50->60->70 (approx) instead of 50->70.

wouldnt a dramatic increase in diameter of exhaust piping leave a larger low pressure area in the corners of the section of piping that is 70mm, causing the exhaust pulses to not make a straight path out towards the muffler? pretty similiar to how a low pressure area above your trunk at high speeds will make air try to circle its way to the low pressure area.
Old 03-08-2009, 07:20 AM
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I believe combat2000 is using a resonated tp. Might want to PM him
Old 03-08-2009, 09:33 PM
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Originally Posted by dROO,Mar 8 2009, 03:06 AM
never heard of anyone running a 70mm resonated tp to reduce loudness, interested to see how big of an impact it makes.

but. can someone explain... why.. it is said quite frequently that you should match a 70mm exhaust with a 70mm test pipe while having a stock header? the diameter of the stock header collector is only 50mm or so. to me it makes more sense to change the diameter gradually, from 50->60->70 (approx) instead of 50->70.

wouldnt a dramatic increase in diameter of exhaust piping leave a larger low pressure area in the corners of the section of piping that is 70mm, causing the exhaust pulses to not make a straight path out towards the muffler? pretty similiar to how a low pressure area above your trunk at high speeds will make air try to circle its way to the low pressure area.
I'm quite interested in this as well. Anyone knowledgeable can chime in?


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