Exhaust comparison - Oem vs non res vs res

[RIV]

The fact that the rods hold up and don't grenade the engine with big power doesn't mean all is well and that they can handle it. Your ignorance = my bliss. Good luck silas!

I don't give a monkeys what you think about me, you're like some creepy stalker obsessively waiting to pounce on my every word, I suggest you get yourself a prescription for some tricyclics the next time you see your psychiatrist, we wouldn't want you turning into some kind of John Hinckley Jr. would we!!! Oh, and while you're at it, it might be useful to get yourself a life and stop bothering me while I get on with mine!! Or are you already residing in some form of institution???

[coffey555]

Has anyone just ran gutted pre-cats with the vacuum valves always open? The car is loud enough for me as it is with the valves bypassed but I am worried that gutting the pre-cats might introduce too much rasp into the exhaust note.

I get the dreaded SQL error when trying to send PM's by clicking on the persons username as well, Dave.

However, typing the persons username manually into the message recipient box seems to work fine.

[Rw@@dy]

Has anyone just ran gutted pre-cats with the vacuum valves always open? The car is loud enough for me as it is with the valves bypassed but I am worried that gutting the pre-cats might introduce too much rasp into the exhaust note.

I get the dreaded SQL error when trying to send PM's by clicking on the persons username as well, Dave.

However, typing the persons username manually into the message recipient box seems to work fine.

I've wondered the same as it's a much cheaper option but not sure if it gives similar benefits

[coffey555]

The standard exhaust manifolds are as good as any aftermarket options so if you gut the pre-cats then you are left with the 200 cell main cat which are apparently better quality items than the Miltek ones.

As the cat-back Miltek system is the same diameter as the OEM one and has similar bends there will be no noticable difference other than noise and a bit of weight saving.

The non-res will drone where I spend most of my time in that rev range burbling around town and I am not sure a res version will be that much different from a stock bypassed one.

Good power gains to be had by just gutting the pre-cats so I will do that and see how it sounds. Quieter Tubi with custom small silencers just after the cats if that proves too raspy.

My R32 sounded amazing with the stock setup and the valve bypassed, I can only imagine how good a non-res would have sounded!

[adsgreen]

A non res miltek with valves closed and all cats fitted is louder than stock valves open.

[Covkiller]

Yep ageed

[PetrolDave]

A non res miltek with valves closed and all cats fitted is louder than stock valves open.

+2

[coffey555]

It must be bloody loud with them open then!

But does anyone know if there is much sound difference between stock bypassed and Miltek Res catback?

[sakimano]

Has anyone just ran gutted pre-cats with the vacuum valves always open? The car is loud enough for me as it is with the valves bypassed but I am worried that gutting the pre-cats might introduce too much rasp into the exhaust note.

I get the dreaded SQL error when trying to send PM's by clicking on the persons username as well, Dave.

However, typing the persons username manually into the message recipient box seems to work fine.

I've wondered the same as it's a much cheaper option but not sure if it gives similar benefits

This would give a little more sound but not much. 10-15 hp and torque though.

[AudiSingh]

Hi guys

I'm also considering a new exhaust setup and reading this thread I'm convinced I want a Milltek non-res valved system. I also want to get the precats removed and do a carbon clean at the same time. Doing the whole job in one go won't be cheap so is there any particular order this should be done? E.g. Precats, carbon cleanup together and then cat back? Or vice versa??

Anyone done all these 3 mods already? How does the motor sound once done?

Ta

[mf51y]

Personally I would be happy to try the center box removal option, I am surprised you cannot get short bypass pipes with male/female ends to simply replace the gap the center box takes...easy no need to weld and modify the original just a couple of pipes with a slight bend to fit existing connections either side.....job for somebody

[toyneg]

Hi guys

I'm also considering a new exhaust setup and reading this thread I'm convinced I want a Milltek non-res valved system. I also want to get the precats removed and do a carbon clean at the same time. Doing the whole job in one go won't be cheap so is there any particular order this should be done? E.g. Precats, carbon cleanup together and then cat back? Or vice versa??

Anyone done all these 3 mods already? How does the motor sound once done?

Ta

hi mate, i have this set up although mine is non valved - this will give you a small idea of the sound

http://www.youtube.com/watch?v=KqSXv9wOE34

[AudiSingh]

HI toyneg

That's sounds awesome!

Defo the right combination to do. Did you do change the exhaust and do the precats at the same time? or did you do the mods individually?

Who did you use for the mods? Unit 20? MRC? I've heard great reviews about both companies

Sorry to bombard with questions. I'm new to the RS4 modding scene

Ta

[toyneg]

HI toyneg

That's sounds awesome!

Defo the right combination to do. Did you do change the exhaust and do the precats at the same time? or did you do the mods individually?

Who did you use for the mods? Unit 20? MRC? I've heard great reviews about both companies

Sorry to bombard with questions. I'm new to the RS4 modding scene

Ta

thanks mate yeah it certainly has had a lot of great feedback

i had the exhaust and precats done at the same time at AMD but used MRC to do the Carbon Clean along with their Stage 2 Remap. i really like the MRC map as they change the throttle map depending on whether you are in sport mode or not. I also had been driving around unknowingly with 340HP so MRC put that right and when i left it was pushing 431 and that difference felt massive!!

[AudiSingh]

Wow that is a massive difference in power!!

Good recommendation about MRC remap too. I will certainly go for that

I don't mean to be a copy cat but looking at the spec of your RS4, I note you have K/W Springs. I really wanted to get an RS4 with Sports Suspension Plus cos the car just looks wicked when dropped but unfortunately I didn't find one with that option so I decided to lower mine. I've been looking into either going for a full coilover setup or just using the OEM DRC shocks and fitting the height adjustable springs package from K/W.

Did you go for coilovers or just the springs on your car?