Yeah, I agree it is over priced, but then I can now just fit it and I'm done, which as far as I'm concerned is far more convenient than the other options available. I
I've been chasing Stealth systems in Southampton for over a year now, they gave me a £500 ish price for a full stainless system a year ago but according to them are still waiting for parts. Hayward & Scott will make you a front/Dump pipe for similar money to the above which goes some way to proving yes it's expensive but not to bad. Tube Torque will make you a full 3" stainless system without the dump pipe for around £800. So I don't think the Janspeed price for the above is to bad at all.
Besides all that with the amount of Goose/ Blue flame systems that run into problems later on in there lives that there so called "life long guarantee" WON'T cover, including, the flanges rust as they will be made from mild steel or the flexi pipe blows which is also partly mild steel, the rattles that come from loose baffles in the silencer, e.t.c. it does beg the question as the the quality of the materials they use and no wonder they can give prices of £500 for a full system with a "Life long guarantee" which isn't worth a s h i t.
I think all these companies say "Ah, yeah we can do a complete system for the GTi-R for 2 bags of rice and a carrot (very cheap), then they see the angle that dump pipe bend has to be and they s h i t themselves.
You pays the money and takes your choice, each to there own, some buy there best shirts from ASDA (perfectly good to go under a jacket and last till the first wash) and some get them from Saville Row (which last a lifetime).