Vespasian

I am now thinking of chipping my twin spark gtv, i have changed the exhaust and air filter which has improved things, next phase is possibily replace the standard chip. Autodelta have a chip for my ts for £200 which should give me 10-12hp.
The question is, will i notice 10-12hp increase, i will notice £200 from my wallet.

So if anyone has chipped their bella, could you let me know what you thought of that mod??, or from the other side of the coin, why i should not,

Cheers