Gts pm tuining plug in chip programmer

hi i have a gts 250 with a brand new pm pipe that pops and farts when cold and on over run pm surgest i need there programming chip to enrichen the fuel mix but this seems a lot of money at £200 hundred quid whem ive already spent £300 on an exhurst has anybody fitted one are they worth the cash

i have not fitted one but have had the same problem and could not fix it so i think this is probably the best way for you to sort it

u mite need a cold spark plug m8