Best exhaust

Righto people,I want to know peoples opinions on the best pipe to use on a Polini kitted tuned to the bo**ox p125.Please dont be biased in favour of SIP pipes because we are using the site! If they are the best fair enuff! Tell me what you think and the benefits of each one,has anyone used a Jahspeed pipe before,not read a lot about them so any help would be appreciated
Ta muchly
Nick [:smokin:]

I agree with dylan, get the SIP Performance.