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Old 20-03-2011, 10:02 AM   #1
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best bore size?

going to get exhaust done on my 2.0 Na R33 soon.getting a decat straight through pipe with no silencer and big jap backbox that will make up forthe no silencer hopefully...whats best bore size so i dont lose power..i just want it soundin nice
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Old 20-03-2011, 10:17 AM   #2
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2.5" exhaust, max.
Be careful though, its very easy to make an n/a RB sound like rocks rattling in a can in the upper revs.
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Old 20-03-2011, 10:26 AM   #3
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hmm so you got any advice on type of setup i should go for...plus would 2.5 be better then 2.1/2" which i was originally going for...basically i dnt want to lose power or fuel js wantin it sound nice n loud want the straight6 sound rumblin n echoin like skylines do n nt broken or chavvy like a saxo lol
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Old 20-03-2011, 10:31 AM   #4
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I don't have bugger all n/a exhaust experience so unfortunately I can't suggest what works, what doesn't etc.
Hopefully someone on here has played around with n/a exhausts and will have the knowledge you need
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Old 20-03-2011, 12:12 PM   #5
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2.5 is the same as 2 1/2
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Old 20-03-2011, 12:39 PM   #6
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sorry lol i meant the standard bore which is i was told and meant to write.. 2.1/4
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Old 21-03-2011, 02:07 PM   #7
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I have a 2.5" exhaust and a decat pipe for sale if any help to you off my r33
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Old 21-03-2011, 02:28 PM   #8
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thanks but already got mine now a 2.5" bore catback straight through to an angled big japbox with decat just waiting for fitting
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Old 21-03-2011, 11:23 PM   #9
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I am going to argue that you would want a 3 inch exhaust.

The reason I say this is actually from Honda K20A experience. All of the 200+ whp N/A 2 liter engines are running 3 inch exhausts.

More then anything the header is going to be more important then the exhaust size.
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Old 21-03-2011, 11:27 PM   #10
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icydude : go fit a 3" full exhaust to a RB20E and see what happens.
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Old 22-03-2011, 11:55 AM   #11
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ill stick with 2.5"
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Old 23-03-2011, 06:56 PM   #12
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icydude : go fit a 3" full exhaust to a RB20E and see what happens.
yes obviously it won't be good.

but I was adding food for thought.

Here is a comparison for a 2.5 inch to 3 inch. 2.5" is the dotted lines, 2.5 inch is solid.

Temp on dyno was 92f for the 3 inch and 73f while dynoing the 2.5.
K20A2
Stock from valve cover to oil pan
RBC manifold
11" intake with velocity stack/filter combo
Tri-Y long tube header
3" Thermal exhaust
Tuned with K-Pro



It's not an rb20e but the header will be far more important then the exhaust itself.
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Old 23-03-2011, 07:33 PM   #13
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i would go for a 3" with an exhaust valve so you can set it,job done
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Old 23-03-2011, 08:18 PM   #14
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exhasut valve??? youve confused me
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Old 24-03-2011, 10:30 AM   #15
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its just like a throttle butterfly/body in the exhaust system so you can restrict it from inside the car it acts as a silencer aswell for built up areas
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