Quote Originally Posted by HOJeepster View Post
So I just had my CTS K04 Turbo, CTS downpipe, ECS Intercooler with hard piping and APR Stage 3 software installed by SCR Performance in Loveland. The driving experience is definitely altered as expected - more turbo lag vs the K03. What I wasn't expecting was the K03 on stage 1 'felt' like it was boosting harder and pulled harder, versus the K04 feels 'stronger' but doesn't feel like it boosts as hard. However, its clear the K04 has more top end power because when i floor it from 60, it goes up to 90 like its the business vs the k03. So in summary, the K03 on Stage 1 'feels' more under 'boost', but the Ko4 feels stronger and more powerful up to 6k rpm. Its going to take some getting use to in driving, but the car is definitely faster.

However, I am getting a weird high pitch sound coming from the driver side dash. It almost sounds like an ear ringing pitch, or a speaker feedback high pitch. Anyone have any ideas what this could be? The sound is a bit louder in the video vs real life, but check it out. What is this? (Leak down test shows no boost leaks).

https://youtu.be/bh6wNsDldhs
Tuned K03 is a torque monster down low & good midrange. K04 is week down low, good in the middle and decent up top. I sort of miss the V8 torque the K03 had in regular traffic. It felt ridiculously quick off the line.


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