RS2 catalysts/exhaust

[pedros_RS2]

Greetings.

My RS2 was a long time without catalytic converters. In the immediate future there were no major problems except the CO2 emissions.

But after a while I noticed that the car hasn’t the same top speed. And after some time the exhaust started making a metallic noise. My mechanic tells me it will be nothing, which is only the exhaust spring that makes noise. The problem is that it is precisely from the noise (5 000rpm) that the car seems to lose power. Another novelty is that the car (very rarely and when requested) made noise/fire pipe.

The car needs the catalysts because the probe lambda. It makes the figures are wrong. What makes you consume more and perhaps even the cause of noise/fire pipe

The catalysts (they are 2) Audi cost 2 € 500.00 so do not feel like much to put them.

Does anyone have any idea of a more economical solution other than Audi?

P.S. sorry for my bad English

[VilleP]

Running without cats doesen't effect lambda or any other values, what motronic sees, only emisson test taken in exhaust pipe are higher. So it doesen't increase fuel consumption or decerase performance. There is someting else wrong, if power is missing.

Easiest and sheapest way to renew cats is to buy universal ceramic race cats, and weld them to oem pipework. they shoud cost around 200€/peace(here in finland). Shoud be found allmost any motortuning supliers.

[pedros_RS2]

And what about the popping (afterfire) in decelerating?
When I change the 1, 2 and 3 gears at top rev I ear (rarely) a big big “buumm”.

It is also normal that that the car gives only the “kick” when I kick down the gas pedal?
Because this is what is happen…

[VilleP]

That "bang bang" sound in deceleration is normal without cats. But if there is misfire during acceleration, you should change sparkplugs, use OEM plugs only. If this doesen't help, then ingnitioncoils are next possible reason.

Admins may move this topic to the right area?

[Fat Audi 80]

Moved...