Best Exhaust Diameter For An Mi

[starky5 18]

I'm looking at getting an exhaust made for my mi, it's standard at the moment but I might try and get a bit more out of it in the future. Nothing crazy tho. The current system in 2.5 inch which seems a bit big, what's the ideal size for the sort of power my engine has?

 

Thanks

[Cameron 16]

2.25" or 2.5" but it doesn't matter, you could fit 3" if you really wanted to.. the important diameters are all in the manifold.

[welshpug 1,666]

one that tapers from manifold to the back is best I believe, any o.e system I've remembered to make note of has been like that.

 

Miles does nice system's with a few bore sizes available.

[petert 601]

Anything over 2.25" is just noise. Even std Mi16's were a 2.25" twin skin, with an ID the same as a 2" system.

[starky5 18]

Yea my current one is stupidly loud which isn't what I want I'm just after a good system that works well and looks as standard as pos

[Cameron 16]

>2.25" won't make it any louder, it will just deepen the tone. Loudness depends entirely on the mufflers.

[petert 601]

>2.25" won't make it any louder, it will just deepen the tone. Loudness depends entirely on the mufflers.

[stef205 92 1 Cars]

my 2.5" exhaust is 89db its all about the mufflers, although i do have 3 boxes

[brumster 135 1 Cars]

I ran 2.25" on my 1900 mi with no problems and it would be my recommendation for a 1.9. If you're planning big numbers, say 210 upwards, then probably not but it sounds like you've not got anything like that in mind?!

[Cameron 16]

The best reason for using 2.25" pipe is that it would cost you less!

[brumster 135 1 Cars]

Indeed! A good point!

[welshpug 1,666]

2" cheaper still

[Cameron 16]

2.25" would be better for a 2.0 16V IMMHOOO!

[Baz 421]

2" is crap even on an 8v.