Best value at the moment would be a JBS04 conversion I recon.
Quoted from another forum.
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Hi
Here are some details on OUR NEW DIRECT REPLACMENT turbo conversions .
The JBS/C-C04 conversions will be available from JBS and ALL C-C agents
There will be 2 entry level kits to begin, with a 3rd top end kit available soon.
kit 1 will be a direct replacement turbo with no injector /airflow upgrades needed.
This will be capable of producing 250 bhp. (inc non dbw)
Kit 2 will also be a direct replacement turbo with injectors ,airflow housing modifications and all the usual bolt on goodies is capable of producing upto 290 bhp . (FMIC,3inc Downpipe /System,CIA,)
We are currently testing five variations of the turbo to determine which trim and level of tune is going to be best for reliability and power/drivability.
Here SOME details on the JBS04 turbo
High flow K04 xxxx Spec Compressor wheel, C.N.C. re-profiled compressor housing and inlet, JBS spec 360 degree thrust bearing, modified water-cooled bearing housing and flow chambers, cut back and balanced turbine blades, lightening of turbine wheel and shaft for faster spool up, modified turbine housing, up-rated twin turbine seals.JBS uprated actuator Other in-house modifications. APPROX 260-290 BHP
Maximum sustained boost level 25-28 P.S.I.
The Kits are Available as of NOW depending on trim,application and BHP level's required.
Prices for the JBS04 conversion DRIVE in DRIVE out ,including CUSTOM-CODE SOFTWARE.
£1500 - £2000 + VAT.
We also have uprated high flow Cast manifolds in stock and are testing as we speak. (more info to follow)
Lastly All KO4 framed 2/4 wd cars can also expect 280-320 bhp DIRECT replacement turbo upgrades with high flow cast manifold. (again more info to follow). This turbo can also be used with our cast manifold as a k03s upgade.
Please feel free to call us on 01246 455005 to discuss your requirements
Cheers
James JBS
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JBS Autodesigns
www.jbsautodesigns.co.uk
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If you want more, then try a big turbo setup.