yunis i will send you a pm with my spec details which could help you on your journey.
John the guy's i deal with who have the r/r in glasgow have been bmw specialists for a number of years in fact they used to turbo charge them using pucker kits ie cast manifolds etc.
They also know a lot about the cosworth engine etc and even though they are critisiced i still trust them more than anyone where my car is concerned.
They do not sell K+N's or power boost valves or turbo zet fan's lol
they dont because they cant show a customer any performance benifit from these and similar purchased items.
They only sell Magnex systems cos they believe they work and can show the performance benifits on a chart.
They are admittedly weeker on gm cars simply due to the lack of them that has been around to tune.
I believe despite many manufacturers having differing opinions regarding turbo selection and indeed engine construction they all use the same priciples ie suck squeeze bang blow lol
Anyhow my point was these guys do not believe the stock turbo is good for more that approx 270 bhp @ flywheel ritchie can confirm the figure maybe since i cant remember exactly.
they also showed on my car that the stock injectors were running out at nearer 230 bhp @ front wheels (unleaded remember)
so i dont care what i read or what magazines claim and indeed believing the marketing blurb for products is a surefire way to throw money away.
I like to see the results for myself even if it is r+d.
I just know my guy's who have been in business for over 15 years know their turbo stuff and only do quality kit which inevitibly they make themselves lol.
I have their own management system bye the way lol.
My other point was more of a question John ? they have been working with a rs turbo recently to develop a turbo kit which allows an upgrade to the larger T 3 cossie turbo unit.
They have discovered big power gains which i will pm you about don't want to mention it here as they are planning to market the kit.
they have an rs turbo escort with zetec 2.0lt bottom and 8v head fast rad cam big garret etc and it has over 280bhp at front wheels 30 odd more than me !!!