The Swift assist springs will be installed and used with my BCR coilovers.
This is what got from their site..Directly from Swift
"Assist springs have two functions. The first is the spring adds a progressive rate to the initial portion of the stroke. This progression can add increased comfort is used on a daily driver coilover setup that has stiff springs installed. It provides racers added softer spring rate progression. Once the assist crushes, the normal spring rate will take over.
The second job is the same as helper springs. They prevent the loss of traction during rebound, and extreme cornering."
But, one thing i notice is that the rear Coilovers does not have room to lower much, if i install the assist springs. I've talked to a rep at Ravspec and they said to compress the assist springs as much as possible. So i'll be trying that once i get everything installed. Pics are my BCRs. take a look and you will notice that the rear does not have much room for adjustment if the assist springs are installed..
As for the plastic cover when installing my Strut Tower brace. I had to remove them. You will need to do some cutting to get them back in. i'm still debating if i want to do that to my OEM side covers. I'll keep everyone posted on how my car handles after all is done.
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I think the questions is: can you put back the two plastic covers on each side of the engine? without any additional modification?
Mly916 answered my question, I figured that you would loose the side panels unless you mod them. I know in the IS300 with some stb's the clearance was tight so some stb's would rub/vibrate on the engine cover. Atleast for me it was during idle that I would hear the vibration but once moving it went away. I like the beefy look of your STB though. I think I want to upgrade my sways first. Does anyone one know if they make f & r under braces for our cars?