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Maximum PSI Turbo Kits
The Maximum PSI Stage 1 catted turbo kit is the only street legal, factory DME tuned kit available for the E46 M3
Stage 2 utilizes similar hardware as Stage 1 but incorporates hardware/software upgrades for even more power on MS109 fuel
Stage 3 utilizes the factory DME with a Maximum PSI engine build using forged internals and a larger Precison turbo.
Stage 4 upgrades numerous components from Stage 3. S4 allows you to do a burnout from corner exit to corner entry.