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Stage 1 is just fuel injectors and a PCM. I don't have it but im pretty sure the boost would be the same, but the fuel flow better. Right??? PSIChick, LilSparkPlug. The expert chicks
With the stock wg and stage 1 your not going to see a big difference. (15 maybe)You need a higher rated spring wastegate to hold more boost. People using wastegates such as agp are setting theirs in the 17 18 psi range.
The Stage 1 is an upgraded PCM and injectors only for the '03's, the '04-'05 SRT-4's come from the factory with the larger injectors already in them, so Stage 1 for them is just the upgraded PCM. You will get 1-2 psi more boost over stock from Stage 1. Stage 1's mainly for increased throttle and boost response and it does great at both.