Should I remap after changing exhaust and dump valve?

[Lefty]

Don't worry, I'm not fitting a beancan and VTA dump valve, I'm getting rid of them instead!

I bought a P1 last week which has the following mods:

AFP hybrid turbo
Front mounted intercooler
3.5" system from manifold back (and a 6" tailpipe - eurghh)
VTA dump valve - eurghh
Remapped and dynoed a few years ago at 352bhp and 317ft/lb

I want to ditch the dump valve and have bought a forge recirculating replacement. I also want to replace the current tiny back box and ridiculous tailpipe with a larger silencer and 3.5" tip to make it look closer to standard.

Would it be wise to have it mapped and dynoed again?

Cheers,
Lefty

[MarJay]

Yes, changing the dump valve to the recirc valve might mean you need to...

[Lazadude]

Won't need a full map, just a check/tweak to check all is as it should, and to note the more restrictive exhaust.

What ECU is on it?

Depends if its running a MAF or using calculated air flow, as VTA/Recirc may need to be readjusted to prevent running lean.

[Lefty]

Lazadude said:

Won't need a full map, just a check/tweak to check all is as it should, and to note the more restrictive exhaust.

What ECU is on it?

Depends if its running a MAF or using calculated air flow, as VTA/Recirc may need to be readjusted to prevent running lean.

As far as I know it's the oem ecu... It certainly still has a MAF sensor.

Cheers for the replies chaps.

I was thinking that changing the backbox and exhaust tip hopefully wouldn't make much difference power-wise, just quieten it down a little and look a bit better!