Exhaust choices - what are you running?

[daddyone]

My last car had 90mm straight decat pipes and standard exhaust, really noticed a sudden "thud" of a pitch change around 2800rpm at light throttle, could even feel it and really didn't like it. Plus it sounded too raspy and tinny.

The new car, I'm contemplating sports cats and a straight system, I'm looking to have a deep gurgle at idle and no drone on the motorway if possible, like hearing the turbo spool too, which is a catless feature.

Now I really don't like the sound of milltek exhausts, or the armytrix one and Akrapovic is way too overpriced as I'll only be keeping this car until the C8 lands.

I must say the car felt quite a bit flatter with the downpipes on, less punchy on boost but the previous map was removed to go to stage 2 and it wasn't from Andy Clarke, who I very highly regard.

Looking for mid to late 750's and torque which won't break things, my old car was an absolute weapon on the standard exhaust and stage 1 but I definitely lost some power when changing to catless.

What ar everyone's thoughts? I like a punchy when coming on boost feel and loud low down when cruising but don't really want it obscenely loud when wringing it's neck a bit. Crackles and bangs need to be kept to a minimum IMO, too.

Car is a 2017 PE model, I would like to keep the valves when in drive and open them in sport, might even try a control module..

[uplandsway]

My last car had 90mm straigth decat pipes and standard exhaust, really noticed a sudden "thud" of a pitch change around 2800rpm at light throttle, could even feel it and really didn't like it. Plus it sounded too raspy and tinny.

The new car, I'm contemplating sports cats and a straight system, I'm looking to have a deep grugle at idle and no drone on the motorway if possible, like hearing the turbo spool too, which is a catless feature.

Now I really don't like the sound of milltek exhausts, or the armytrix one and Akrapovic is way too overpriced as I'll only be keeping this car until the C8 lands.

I must say the car felt quite a bit flatter with the downpipes on, less punchy on boost but the previous map was removed to go to stage 2 and it wasn't from Andy Clarke, who I very highly regard.

Looking for mid to late 750's and torque which won't break things, my old car was an absolute weapon on the standard exhaust and stage 1 but I definitely lost some power when changing to catless.

What ar everyone's thoughts? I like a punchy when coming on boost feel and loud low down when cruising but don't really want it obscenely loud when wringing it's neck a bit. Crackles and bangs need to be kept to a minimum IMO, too.

Car is a 2017 PE model, I would like to keep the valves when in drive and open them in sport, might even try a control module..

APR Downpipes only ?
IPE Sports Exhaust onto your choice of downpipes ?
Peron Downpipes only?
*** down pipes onto stock exhaust with resonators removed?

Plenty of choices and everyone will have an opinion

You also said in your wanted ad "louder the better" , so if thats the case then its milltek non res with peron downpipes

[Tadass910]

Miltek none resonated exhaust and stock Downpipes = deep amg sound

[CyanideX]

The best place to buy the Miltek non res?

[Tadass910]

I guess milteksport.com

[bn8959]

The best place to buy the Miltek non res?

I bought from Roadrunner Motorsport online. Was the cheapest I could find. Good service from them too.

[Iain]

Mille non res - on my 2nd RS and 2nd Mille - as posted on another thread, revolution get my vote - cheaper than Roadrunner as I used them as a baseline for pricing.

[daddyone]

Thanks for the opinions guys, I'm sided to going milltek and leaving the downpipes as they are. One question however.... Are the PE cats and downpipes actually sports cats already i.e. high flowing? Does anyone know if I'm expecting massive torque / hp differences versus aftermarket sports cats or catless? I must admit my standard car was mapped the day I bought it, seems massively quick. When I had the downpipes fitted and a map change (granted from someone different) the car seemed to breath better (throttle response) but lacked torque, I wonder if that had something to do with hardly any back pressure, or maybe just a pants map?

[Tadass910]

In my opinion if you change only exhaust and put none resonated version and leave stock Downpipes car breath more free instead of adding cattle’s Downpipes and leaving stock exhaust

[CyanideX]

Miltek Cat-back non res installed today, Bloody awesome!

[MikeFish]

Miltek Cat-back non res installed today, Bloody awesome!

Yes, it is!

[daddyone]

Decided to go for catless downpipes, change the whole exhaust for free flowing, non res custom one and adapt primary cats to be fitted just after downpipes for MOT...

[Tadass910]

Miltek Cat-back non res installed today, Bloody awesome!

[daddyone]

Straight through from catless pipes to original backboxes (until I can find a suitable valved backbox set to retain the noise control). Sounds perfect and grunty, grumbly and not raspy. factory backboxes are 2.25" inlet so I'll only be changing them for flow reasons, but the car is quiet on idle with valves closed, stay below 3k rpm and it's quite civilised, will be having to map out the cold start mainly as it's no longer needed (no cats) and quite loud. Should be able to creep off the drive in relative silence and open it up on the motorway / fast A roads.

Few niggles with the exhaust but it's a very tight fit and needs a little adjustement, will leave it a week and go back.

Overall quite happy although it took a long time to do.!

Link to 2nd / 3rd gear pootle around in 40 limit... https://www.dropbox.com/s/kr7te7wjwsumz ... 2.mov?dl=0

Interesting the pops and bangs are gone completely in drive, would like to lose those in sport so will play with overrun fuelling to get rid. In D the valves are closed so a quarter of the noise. Will be looking into mapping valves open in sport with minimal pops, d mode stealth until floored, when valves open at 50% requested throttle.

Forward thinking made me get the front section made with bosses, and I'm going to get a pair of sports cats fabbed into that piece to make the system legal and use the straight pipes for track use. Apologies for the phone video, but the audio on GoPro didn't capture the tone very well at all.

[MikeFish]

Interesting the pops and bangs are gone completely in drive, would like to lose those in sport so will play with overrun fuelling to get rid.

That's always been the case. For pops and bangs you need to be in Sport, whilst in Drive there are no pops and bangs.
Rather than mess with the mapping you thought about just getting a separate exhaust valve controller like one of these:
CETE / Milltek:
https://www.demon-tweeks.com/milltek-ac ... lsrc=aw.ds

ASR Component:
https://asr-component.de/startseite/40- ... g-rx1.html

This way you can use Sport / Drive (just pull back on the gear lever to change) to control the pops and bangs then use the controller to dictate how loud it is (with or without pops and bangs depending on Drive / Sport).