Firstly apologies as this has been done to death before.

Prodrive BB £350 + no affect on warranty
SS BB £300 = possible affect on warranty (or am I a bit overcautious!)

Which one should I have ?

Dealer can get me a Prodrive BB next week - heard it idling last night and sounded nice. Also, is it easy for me to fit ? Do the PPP Imprezas just have a Prodrive BB or do they also get more exhaust parts ?

Thanks

 

SS BB: Rumbly on idle, nice and deep on throttle, not too subtle.
PD PPP BB: This is fitted in conjunction with catless STI centre,features subtlety up to 4000 rpm, then banshee scream on full throttle.
PD lone backbox: oval version of PPP box, apparently similar characteristics to PPP box.
Had both SS and PD PPP. PPP wins for me because you have choice of loud and quiet. Each to his (or her) own.