Fitted a new (well second hand) Stealth exhaust to my '08 Uly XT Saturday and all seems fine .. definitely sounds better and runs fine except for a lot of pops and bangs on the over run now. Should this sort itself out ? Do I need to do a TPS reset ? Different map ?

Air leak

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If your dreams don't scare you, they are not big enough.

As Adam says, check for air leaks, however they all do this unless you adjust the mixture when the throttle is closed.

The standard exhaust is very "long", so on the over run you don't suck air back through the exhaust as far.

You can attack it in two ways, either richen the mixture a tad (as you would increase the size of the slow running jet on a carb) or do what I do and pull the fuelling down by 20% at the TPS corresponding to closed throttle, down to about 2500rpm.

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08 Specialized Langster

**creeps in to tech without being noticed *** ... or you could just leave it

Mine used to pop and bang a good'un on overrun and I likes it!

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"With square conduct, level steps, and upright intentions ..”

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Valencia Orange XB12Scg - serviced by Maz 2018
Black P3 Blast - serviced by Maz and fixed by Maz in 2019

Cheers all ... air leaks where ? Considering how much effort it was to get on I don't think there's a gap at the header

If there is an air leak you will feel warm air being blown out. Put your hand near each joint.

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08 Specialized Langster

I also think, that the stock exhaust has several chambers, which the aftermarket exhausts usually do not have, so every bang goes straight out then and is not muffled as with the stock one.

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"It is often said that before you die your life passes before your eyes. It is in fact true. It's called living."
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I've got a stealth ( or as Maz like to call 'em chav pipes ) Ha Ha Ha. On my xb12
and yes they all do that, though it does it a lot less if you use super unleaded and preferably shell rather than tesco's though it does cost a tad more. Hope this helps

My 08 XT with full earlier year stainless system also pops on throttle overun is it doing any damage to the engine:?

Both mine pop on overrun XB9 with an Albert and the M1, I likes it

I've got a stealth on my xb12 ..it bangs and pop too...and i luv it.

I will check for air leaks but it does sound as if it's par for the course .. this adjustment, is that via ECM Spy ? Fun as the pops and bangs are I could live without them

My '09 with a '07 headers and a Remus (quiet baffles in) does this. I didn't like it at first but have got used to it. It is worse with the baffles removed. The oe exhaust used to pop and bang as well.... just more quietly!

Apart from the farting it runs much better with this exhaust set-up.