We've just had a bit of a play with our Vauxhall VXR8 long-termer, fitting Walkinshaw Performance's Power Pack.

_Y8F9555 The kit comprises a revised air filter, an ECU upgrade and a stainless steel exhaust that lifts the regular VXR8 rumble up to 92dB. It also frees up an extra 30bhp.

Thing is, I've been wondering ever since the car came out of Walkinshaw's workshops if I've done the right thing. The performance exhaust that's been fitted is only the 'minor' upgrade, you see; Walkinshaw also produces a V8 Supercar unit that turns the volume up to 110dB - and accompanies it with a cacophony of crackles and backfires. So I've been torn between driving a car that sounds like a Bathurst racer, and, er, living with one.

Today, I got my answer, for Vauxhall has helpfully fitted the V8 Supercar unit to its latest press demonstrator, the LS3-engined 6.2-litre VXR8. After five minutes I was nearly biting the steering wheel with frustration, because it sounds fantastic.