Best exhaust system for an RS4?

[WilkinsonRS4]

I'm looking at maybe upgrading the cars exhaust system for something a bit louder to really show off the sound of the beautiful V8!

I'd prefer Non-res but would like to keep the valves

Would anyone recommend an upgraded airbox aswell or would it not be worth doing?

HiSmithy
I recommend keeping the original as it's SS and build quality is better than aftermarket, modify the original, I did and took sections out limiting it and welded in new SS sections, the rumble I get is just amazing although my sport button is none exsistent now as the flaps are permanently open got it deflapped after exhaust and inlet manifold was done.

[S4Player]

Jhm exhaust sounds superb, looks superb and performs the best of them all. Just a pity they seem to be so costly to get to the uk

[MikeFish]

Or you could all forget about these girly exhausts and get a man's one:



If Yorkie made an exhaust, this would be it.

[neilparf]

Nice sound, Mike!

Must treat it it a wash though!

[sar]

Jhm exhaust sounds superb, looks superb and performs the best of them all. Just a pity they seem to be so costly to get to the uk

x100

finally someone who knows what they are talking about.

[neilparf]

Jhm exhaust sounds superb, looks superb and performs the best of them all. Just a pity they seem to be so costly to get to the uk

x100

finally someone who knows what they are talking about.

I agree. It's a great great system and I even considered it when I purchased mine. But when it's so costly landed in the UK, it slips down the list for consideration somewhat...

[sync24]

I agree. It's a great great system and I even considered it when I purchased mine. But when it's so costly landed in the UK, it slips down the list for consideration somewhat...

I too wanted a JHM system but as Neil has said getting them into the country is prohibitively expensive due to import tax/courier costs, so much so that a UK fabricated system by a specialist is the only viable solution [unless you don't care about costs or you want to go 'off the shelf']

I recall having a conversation with Doug @ MRC about exhausts when he did my stage 2. The man said "cat back exhausts on the RS4 are all about what noise you want and there are very little power gains to be had, all the power gains are in the downpipes and the removal of the 400CEL precats" - Personally I think that makes sense.

[neilparf]

I agree. It's a great great system and I even considered it when I purchased mine. But when it's so costly landed in the UK, it slips down the list for consideration somewhat...

I too wanted a JHM system but as Neil has said getting them into the country is prohibitively expensive due to import tax/courier costs, so much so that a UK fabricated system by a specialist is the only viable solution [unless you don't care about costs or you want to go 'off the shelf']

I recall having a conversation with Doug @ MRC about exhausts when he did my stage 2. The man said "cat back exhausts on the RS4 are all about what noise you want and there are very little power gains to be had, all the power gains are in the downpipes and the removal of the 400CEL precats" - Personally I think that makes sense.

As Kev mentions, power gains are all about the 400 CEL precats - after that, bar 100 CEL race cats, there's no mystery or magic in the system to scavenge another heap of BHP. Doug at MRC also mentioned to me that the Audi 200 CEL cats are actually not bad. After this it's sound and quality of manufacture...

[MikeFish]

Nice sound, Mike!

Must treat it it a wash though!

LOL, that was in the middle of all that snow we had 2 years ago so my car was filthy.

[MikeFish]

I agree. It's a great great system and I even considered it when I purchased mine. But when it's so costly landed in the UK, it slips down the list for consideration somewhat...

I too wanted a JHM system but as Neil has said getting them into the country is prohibitively expensive due to import tax/courier costs, so much so that a UK fabricated system by a specialist is the only viable solution [unless you don't care about costs or you want to go 'off the shelf']

I recall having a conversation with Doug @ MRC about exhausts when he did my stage 2. The man said "cat back exhausts on the RS4 are all about what noise you want and there are very little power gains to be had, all the power gains are in the downpipes and the removal of the 400CEL precats" - Personally I think that makes sense.

As Kev mentions, power gains are all about the 400 CEL precats - after that, bar 100 CEL race cats, there's no mystery or magic in the system to scavenge another heap of BHP. Doug at MRC also mentioned to me that the Audi 200 CEL cats are actually not bad. After this it's sound and quality of manufacture...

+2

[sar]

I agree. It's a great great system and I even considered it when I purchased mine. But when it's so costly landed in the UK, it slips down the list for consideration somewhat...

I too wanted a JHM system but as Neil has said getting them into the country is prohibitively expensive due to import tax/courier costs, so much so that a UK fabricated system by a specialist is the only viable solution [unless you don't care about costs or you want to go 'off the shelf']

I recall having a conversation with Doug @ MRC about exhausts when he did my stage 2. The man said "cat back exhausts on the RS4 are all about what noise you want and there are very little power gains to be had, all the power gains are in the downpipes and the removal of the 400CEL precats" - Personally I think that makes sense.

As Kev mentions, power gains are all about the 400 CEL precats - after that, bar 100 CEL race cats, there's no mystery or magic in the system to scavenge another heap of BHP. Doug at MRC also mentioned to me that the Audi 200 CEL cats are actually not bad. After this it's sound and quality of manufacture...

yer delivery and duty is a killer, it is a large box!.
but i still dont think its crazy priced. a full milltek with sport downpipes is about £2300-£2400. JHM's is £1835 for the full system + delivery £300-£400 and duty say another £500, £2735 in the uk or there abouts. £335 dearer than the milltek.

i agree the vast bulk of the gains come from cat removal, just stabbing out your pre cats on a standard exhaust will give you the same gains as 95% of the aftermarket exhausts out there for the rs4.

i agree there is no mystery and magic in the system to scavenge another heap of bhp, but there is engineering, gas flow modeling and testing ect, to eek out them last few ponies.

as saki said in the capristo thread its easy to make the rs4 sound great because rs4's sound great.
it is a lot harder to make an rs4 go quicker..........

[neilparf]

Nice sound, Mike!

Must treat it to a wash though!

LOL, that was in the middle of all that snow we had 2 years ago so my car was filthy.

The nice clean white trainers make up for it though! Reebok or Nike?

Surprised you didn't get a ticket on those double yellows!

[neilparf]

yer delivery and duty is a killer, it is a large box!.
but i still dont think its crazy priced. a full milltek with sport downpipes is about £2300-£2400. JHM's is £1835 for the full system + delivery £300-£400 and duty say another £500, £2735 in the uk or there abouts. £335 dearer than the milltek.

You still have to fit the JHM after that too and the JHM is non-valved so a cost there vs JCWF...

Sure the Milly is more than that?

JCWF Buzz bar is better looking than the JHM

I would say the final turn from the centre pipes on the JHM to the back box is ever so slightly smoother that the JCWF.

[MikeFish]

They are light grey air max '90s. The double yellow lines were on an industrial estate in the middle of the countryside. There was no traffic warden (or other cars) within about 3 miles. I went there cos I can't really rev the engine like that anywhere else without annoying everyone within a mile radius.

[neilparf]

They are light grey air max '90s. The double yellow lines were on an industrial estate in the middle of the countryside. There was no traffic warden (or other cars) within about 3 miles. I went there cos I can't really rev the engine like that anywhere else without annoying everyone within a mile radius.

LOL! Love a a pair of Air Max 90's! Sorry, thread digress!