What size Exhaust?

[wynode]

The best exhaust diameter for your car really depends on how many modifications have already been done and also the desired outcome and/or application.

I won't bother delving into which headers are best to get for your car because there is a lot of argument as to which is 'best' header. Search the forums for more info on headers.

Here is a rough guide as to exhaust piping diameters for common Honda engine capacities.

NOTE: The following is only a rough guide and is in no way appicable to all cars

Non-VTEC
1600cc - 2 Inch
1800cc - 2 or 2.25 Inch
2200cc - 2.25 Inch

DOHC VTEC
1600cc - 2.25 Inch
1800cc - 2.25 or 2.5 Inch
2200cc - 2.25 or 2.5 Inch


*All values are internal diameter.

The second set of values given are if you are after a strong top end however it should be said that you will be sacrificing low RPM torque as a result. Most exhaust shops will advise you of the lower value to give you a good spread or power throughout the rev range, but if you are after good power for race situations, I would advise going for the second set of values.

The key is to have the same diameter throughout the system from the collector all the way to the muffler for optimal performance. There is a common saying "A chain is only as good as its weakest link" and the same applies here in terms of keeping a constant diameter piping all the way through.

[Mugen4g4door]

sohc vtec?

[replaced]

should sohc vtec just stick to non-vtec or vtec? *confused*

[wynode]

SOHC-VTEC can go with 2" or 2.25" depending on the mods / requirements.

[h22accord]

My 1st exhaust on my 96 accord was 2.25 when i did my h22a conversion i was told to up-grade to 2.5, big mistake lost heaps of power,2.5 would be good when you start putting big cams and start getting into serious engine mods.

[xedent]

what about Exhaust tip, does it matter what size that is?

[wynode]

What size is the rest of the exhaust and what muffler is it?

[xedent]

What size is the rest of the exhaust and what muffler is it?

i think that it is stock

[wynode]

Then it won't make any difference!

[AsH_]

i gota stock B16A, would a 2 1/2 be 2 large???

i know it provides better top end but is it gona be weaker in the bottom end than the stock exhuast, coz of not enough back pressure???

[SPQR]

what about Exhaust tip, does it matter what size that is?

Just out of interest, the nicer looking CU2 exhaust tips fit perfectly on a CL9. The part number is: 18310-SJK-305

It probably adds 10km/h to top speed. But I wouldn't really know since the nanny-state Party in power here put a speed limit on the Stuart Highway.