Does anyone know where I can buy a proper 3 inch downpipe for a JDM EVO II? I only seem to be able to find 2.3 inches and 2.55 inches options. Thank you.

 

I'm pretty sure is the same as a 2G DSM. STM has them..

 

It's definitely not the same as a 2G DSM. Only Evo123-specific downpipes will fit. Your only options these days for the 3" are the Hayward & Scott units from the UK; the A'Pexi N1 downpipe & Fujitsubo downpipe are not a full 3".

Hayward & Scott - https://www.haywardandscott.com/mits...html?mode=list
A'Pexi - https://www.summitracing.com/parts/apx-145-m001
Fujitsubo - https://www.rhdjapan.com/fujitsubo-s...cd9a-ce9a.html

 

I'm tryingto build an entire exhaust system anyway so if I purchase the 2.5 inch system 3 inch downpipe and the centre pipe and the back box that completes the system? or do I need a cat pipe too? Thank you.

 

You just need a downpipe, cat pipe and catback. It's a 3-piece system; that mid-pipe is something only they sell, it seems to put the downpipe and cat pipe all-in-one, so it's redundant. I don't know why you would go for a 3" downpipe just to neck it down to a 2.5" catback. You can go with their 3" downpipe, and any 3" cat pipe (with or without cat), and any 3" catback. As long as the diameters are all consistent, because some catbacks are 3" except for a 2.5" flange to the cat.

 

Im still confused. their center pipe looks like it has the cat pipe in it. So figured i need the downpipe, center pipe and back box, terms used on their site, to complete the system. is that correct?

 

Ah my bad, I misunderstood the pictures. H&S are the only ones who sell the the back-box separate from the center pipe. They have a 4-piece system, everyone else is 3-piece. So yeah, get a full 3" system - the last 4 items on the list.

 

Ah I see so i do need the cat pipe. Thank you so much for your help!