i have a 4x4 sapph running on dark greens,stage2 chip,3 bar and a t34.63 at present running at 327bhp.i am wanting to get nearer the 400 mark will adding a stage 3 chip and greys get me there with a re map

 

your get 380ish mate after that it get expensive!!

 

go for the blacks, the siemens injectors, you get them in different poundage to suit your power etc...

more boost and a live map will help you get what you are after but it will put strain on yor gearbox and in time it will break.....i know....been there and done that.

 

As Dave says, remap, injectors, but once you're in 400 bhp territory with a 4+4, the box starts to suffer..