Mmmm, Where do I start.......

Anything over 350bhp and it's starting to get expensive.....IF YOU WANT IT TO LAST, AND USE THE POWER REGULARLY.

Think Mountune WRC Head Gasket at 360 quid + Vat

Think Injectors.....Gray's at Least.

Head Work..... I paid 2k for this.

Cams, and don't forget, depending on what drivability you want, depends on what cam you want....leading to the possibility of having to have pocketed pistons.....and if you've gone that for, you might as well have low compressions ones as well.

Then of course the standard Intercooler will be totally useless, as will the mapping, so now you've reached about 5k, and you've still a long way to go.

T34 : Low Lag, Good Mid Range Power, Drops off at much above 6k, and on it's last legs at 330bhp.....Will produce it, but for how long.

T38 (Universal Turbos) Very Similar Characteristics to T34, but will continue to produce boost to 7k and over. Proven to give 430bhp with the correct other parts.....Head, Cams, Comp Ratio, Ancillaries, Intercoolers etc.

T38 (Turbo Technics) Again, Similar Characteristics, (Slightly later pic up)....but keeps going even further up the rpm range.....but do you want a good torquey engine ....... or a screamer.......and which will last the longest and be the most driver friendly on everday roads.

T4 I feel controversy coming by the truck load. But my opinion only ...............Best place for a T4 is in the Bin.

Anyone can build a 400bhp cossie engine, but it's building one that lasts.