Revs increase on lift off

[urS6Tom]

I've just had a new 3" turbo back system fitted and it sounds
great

one thing that's odd though is that when I lift off the the throttle completely, the revs jump up a few hundred rpm. It's a bit like a lazy gear change where you don't complete take your foot off the accelerator.

Is this normal? I wasn't expecting it. What's happening?

Cheers Tom

[Ducky]

Does it do it if you blip the throttle at standstill, or only when driving. Can't see how a pipe would cause that, nothing fouling the throttle cable or anything?

[dest]

Sounds like the idle valve needs a clean

[Henkjan]

there is this damper at the throttle body that might need adjusting, I had a similar effect with my new dp, turbo just keeps pushing

[martinjs]

Did you sort this Tom?

Any pics of your exhaust? or a video clip?
V-bands?