Here Are Some of the Popular BMW 135i 335i Turbo Upgrade Options:
Turbo Lab: 39.6mm x 56mm CW + 9 blade Drop in Turbine 35mm x 40 TW $1050 (tdo3) (includes turbo rebuild, repair of wastegates, larger compressor wheels, and balancing)
If you Just want the rebuild service, or wastegate repair service without the upgrade. We do offer the individual services below:
Wastegate flapper repair including parts: $300 (Both Turbine Housings). Turbo Rebuild $350 (Both Turbos). (Basically if you just want the rebuild without the upgrade, the cost of the repair is 650$.)
Our Upgrade Adds 47 Horsepower over Stock With Other Modifications The Upgrade is Good for Up to 550HP!
RB Turbos : 41 x 56 Comp Wheel 41 x 45mm Turbine Wheel (tdo4) $2999
Vargas Turbos 47mm x 58mm Comp Wheel 45 x 50mm Turbine Wheel (tdo4)(20t) $3799
Dinan Turbo Upgrade (Similar as Turbo Lab) $1599
Details On The HEXON Turbo Upgrades: (Discontinued)
42.9mm x 56mm Billet Compressor Wheel
Turbine Wheel (Exhuast Side)
41mm x 44mm 9 Blade
Here is the Process of the Turbo Lab Upgrade that we do for $1050. This includes machining the compressor housings, bearing housings, the billet wheels, clipping and rebalancing for both turbochargers.