DO NOT BUY INVIDIA. they may refer to it as "RS-R invidia", and yes, at one point the RS-R and invidia names were of the same company. but RS-R disbanded their relations with the "invidia" name, so in reality, an "invidia" exhaust is just as good as a generic ebay exhaust. you will be sacrificing quality and will risk your money. check the RS-R website at http://www.rs-r.com
and go check for yourself..invidia is no good.
however, rs-r has a similar exhaust, the ExMag GTII, which will cost more and has a similar design, but will also ensure quality and performance.