Secondary cat delete - costs and issues?

[JohnnyMcC]

Thanks for that. Are u getting any drone st approx 3k rpm?

Ive got middle boxes removed might as well not bothered. Was gonna do secondary cat but will prob get dummy ones for mot. Government run over here so can't risk it

Sent from my SM-G930F using Tapatalk

[Jim Haseltine]

The middle boxes are resonators, they chop some of the high frequency noise but don't do much else. Wrapping the pipes inside the rear boxes makes a lot of difference to the sound of the exhaust.

[JohnnyMcC]

Tried loosinging the 02 Sensors and they wouldn't budge. Scared to force it. Anyone use Heat???

Sent from my SM-G930F using Tapatalk

[JohnnyMcC]

The middle boxes are resonators, they chop some of the high frequency noise but don't do much else. Wrapping the pipes inside the rear boxes makes a lot of difference to the sound of the exhaust.

Sounds interesting. What do u mean by wrapping? How do u get in there to do so? Any pics?

Sent from my SM-G930F using Tapatalk

[Caino6]

No droning, wouldn’t even know it’s been done on motorway journeys 70mph. But you certainly know about it once you press on the loud pedal.

[Jim Haseltine]

The middle boxes are resonators, they chop some of the high frequency noise but don't do much else. Wrapping the pipes inside the rear boxes makes a lot of difference to the sound of the exhaust.

Sounds interesting. What do u mean by wrapping? How do u get in there to do so? Any pics?

There is (or was) a thread sometime back with pictures of the job. Put simply, it's a case of cutting open the boxes, removing the packing, wrapping the perforated pipes with heat proof foil and exhaust wrap then welding the boxes closed again. There's a bit more to it, like knowing where to cut the boxes etc.
I thought of doing it to my exhaust while I had the car off road but in the end decided against it.

[JohnnyMcC]

Thanks for that Guys. I def thought there Would be a drone with the back boxes removed.

Due to MOT hurdles I may go for back box delete for handyness. Well if u call putting them back on every yr for MOT.

Found this system today but the tips look a tad small

https://www.ebay.co.uk/itm/154200855801

Sent from my SM-G930F using Tapatalk

[Caino6]

I’d go for the cutting out and weld in straight pipe option. That way you can retain the original tips for a standard look. And in my opinion the standard tips are spot on. But that’s just my opinion, the link for eBay. I’m not sure if that is compatible with RS6 C6

[JohnnyMcC]

Sorry mine is a C5 lol

They do one for the C6 also.

https://www.ebay.co.uk/itm/153735547998

I need to keep the original for mot its government run

Sent from my SM-G930F using Tapatalk