custom exhaust help

[daymo69er]

ive fitted the m52 engine to my car and looking at making a new exhaust system as i think the exhaust on it the pipe diameter is to small...because its a 1.8 one,

could someone tell me the best size of pipe to use, people are saying 2" but then people are saying 3"

will be using a lengh of stainles just curiouse what pipe to use thanks:) ,

[eko]

Twin 50mm on mine.

[blingsta]

i think 3" is to big.. 2.5" would be perfect

[Jozi]

Twin 50mm on mine.

This

[daymo69er]

I think im going to go for a 2.5"

[e30-EVN]

single 2.5 is the best for gains and sounds the nuts aswel.!

[daymo69er]

thanks for that mate, people are saying u get more power with twin pipes not just one? , is this true? i no u said its best for gains u mean power?

thanks:)

[DanThe]

Basic maths -

Cross section of a 2.5 inch pipe is 4.9 square inches
Cross section of a pair of 2 inch pipes is 6.3 square inches

[makman]

so get two 50mm pipes then? with cross section?

[bimanut]

By cross section he means the total area inside the pipes.
Some people use "X" pieces and some dont.
iirr m20 pipes dont have them,but the E36 pipe i`m using the two pipes connect into one then comes out as two.
Twin 50mm pipes ftw