what exactly are you trying to acheive from your car tho,
unless you want well over 400bhp i wouldnt bother with one imo, they can be a complete hassle after a short period of time as they crack quite easily. i've heard stories of the Greddy mani being a t**t for it and a pal of mines had his DP mani welded twice in the space of a year. plus i've had one myself and i'm sure Rishi will tell you it completely dropped to bits.
the money could be well spent else where.