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***TII vs. NA Compatibilty***
These must be cross compared to the S4/S5 compat. information. Anything not mentioned, presume swappable.
Engine
-Engine internals:
------>Rotors: Yes, but different compression ratios. Will need counterweights as well.
------>E-Shaft: yes, but needs rebalanced, unless in the same series of rotors, and you'll need the matching counterweights for the rotors used.
------>Intermediate Plate: Yes, but there may be some port timing differences.
------>End Plates: Yes, but the NA version has the 5th and 6th ports. the turbo models do not.
------>Housings: Identical minus the exhaust sleeves. The turbo sleeves do not have the diffuser.
------>Front Cover: Yes, but the turbo front cover has an oil return inlet
------>Oil Pump: Yes, but there is a difference between the turbo and non turbo pumps. The turbo pump is a slightly nicer improvement over the non turbo pumps, yielding slightly higher oil pressures.
-Fuel Injectors: yes, but as noted in sections above, the Turbo injectors where 550cc, and the NAs 460cc. Also, the connectors for the injectors are shaped different for low and high impedance to prevent accidental swaps.
-Fuel Pump: yes. TII model flows more. but its better to get a FD pump for cheap or a Walbro or similar.
-Radiators: Identical, variance found in manual vs automatic transmissions.
-Water Pump: Not swappable. The turbo model has a provision for coolant line running to the turbocharger.
-MAF sensor: Not swappable, reads differently.
-Coil Packs: They are the same, don't let anyone charge you more for "TII" coils, when they are the same coil, and the same part number as ones from an NA.
-Intake Manifold: The short answer is no. as NA models are 6port, turbo models are 4port. The manifolds will not line up when interchanged without major modification. If rebuilding your engine, things can be done to remedy this problem.
-Throttle Body: No, reversed design.
-Throttle Cable: No, longer for the TII by a significant amount as it wraps around the front of the engine.
-ECUS: No. See "ECU CODES"
Driveline
-Transmission: Yes. TII is a beefier unit. But requires all related parts below in order to be swapped.
-Driveshaft: Required for trans. swap.
-Axles: Required for trans. swap.
-Slave Cylinder: Required for trans. swap.
-Differential: Required for trans. swap. Beefier. Has LSD.
-Flywheel / Pressure Plate / Clutch: Required for trans. swap. Different diameter.
**Supposedly you can use the TII transmission and NA Diff and use an Automatic drive shaft to make it a bolt up deal...not positive, but this has come up several times***
Suspension
-Sway Bars:No for certain models. The TII sway bars and the 88 GTU sway bars are the same. I also **believe** that the GXL sway bars are the same too, or at least make a negligible difference in handling. For vehicles which do not have a LSD installed, changing the sway bars to ones from a model which did will cause under steering, as the sway bars where meant to compensate for the effects of the LSD in cornering.
Body/Interior
-Gauge Cluster: Sorta, the Turbo version has a "boost" gauge in place of a voltmeter on the NA models. The NA can go onto the TII version, and for whatever reason the Voltmeter will work.
-TII Seats: Yes. And they are a hell of alot more comfortable. If you see black leather TII seats in a parts car. Steal them!!
-Body Panels: all are swappable. Hood is scooped for use with top mounted intercooler. Turbo models for the S5 did come with a front chin spoiler and a factory aero kit.
-Chin Spoiler: On the S5 turbo models. Hard to come by, will fit any S5 bumper. may require minor modification to existing bumper to mount.
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