Looking to stay just bolt-ons for a lil while longer, but have a feeling that my stock springs are getting a lil weak. The car has 81K miles on it, and is showing a dip in the dyno graph around 52-5300 rpms, then comes back up around 5700 or so. When the car is cold, it's shown as much as a 75 rwhp drop during thos periods, but as the car gets warmer, the dip gets smaller and smaller.
I also have an audible detonation, but according to the Wideband O2 readings on the dyno, my air-fuel is dead on.
I'm thinking I might be getting a lil valve float, so I thought I would replace the stock springs and see if it helps.
What are your guys' opinions?
Thanks!