H22 JDM 4th gen stainless manifold and downpipe

grant_day · Post by **grant_day** » Mon May 14, 2012 11:12 am

H22 JDM 4th gen stainless manifold and downpipe, that's all I want, do you have one? Or know.where I can get one?

Post by **NafemanNathan** » Mon May 14, 2012 11:29 am

Are you looking for performance gains Grant or just aesthetics on a standard build?

Post by **NafemanNathan** » Mon May 14, 2012 11:32 am

May need to do some checking to see if this is a direct replacement for a JDM or not...

http://www.ebay.co.uk/itm/honda-prelude ... 27c6fc09b0

It probably won't give you any significant power gains on a stock engine, but should change your exhaust tone

grant_day · Post by **grant_day** » Mon May 14, 2012 11:34 am

Power gains would be great but its mostly so I have a full stainless system really

Post by **Merlin** » Mon May 14, 2012 11:45 am

The Japspeed manifolds are UK / USDM fitment.

grant_day · Post by **grant_day** » Mon May 14, 2012 11:53 am

I don't think it would fit, I have asked the seller before and was told it would need modifying to fit the Jap spec

Post by **NafemanNathan** » Mon May 14, 2012 11:53 am

Ahh, so that one won't be any use to you Grant unless you go for a UKDM cat/decat as well then.

Side note: Have we confirmed yet whether a UKDM catback is exactly the same as a JDM? I've never had a UKDM, so never done the comparision myself, but know it's a question that always crops up.

grant_day · Post by **grant_day** » Mon May 14, 2012 11:57 am

I'm sure the UK ones are shorter than the Jdm ones

Post by **NafemanNathan** » Mon May 14, 2012 12:03 pm

I've probably opened a can of worms here, but I always thought the catback was the same length, and it was the downpipe + CAT that varied in length (ie. a JDM downpipe is longer, but has a short cat and a UKDM downpipe is shorter, but has a long cat). I've never had a UKDM Vtec, so have never been able to confirm it myself.

I've never seen or heard of a conclusive answer to this, as it's always just speculation, so it would be good to finally hear from someone who knows the answer, and then it can be Wiki'd

Post by **indigolemon** » Mon May 14, 2012 12:05 pm

The downpipe/cat combo sets the length. JDM cats are longer and have the temp sensor built in. Quite a few exhaust systems come with an adjustable section to connect to the cat, allowing JDM or UKDM fitment.

The issue with the fanimold is a different one however, as apparently the stud pattern for connecting them to the block can be different between JDM and UKDM H22's. This one I have yet to personally see confirmed though.