[94SSman]

I'm running the MSD billet opti. This thing was $500+ shipping. I think it's a nice unit and it looks GREAT. I do NOT like the adjustable timing feature. Come on, it's 2009 now. If I need to adjust my timing I will do it through the PCM.

I have heard stories of the MSD unit changing the timing unintentionally. It has a screw that allows you to adjust the timing and sometimes, according to what I have heard, it can back out. I cannot say whether this is true or not as my unit has about 78.3 miles on it.

 

[94SSman]

Thanks for the quick responses. Did you notice any performance difference?

Yes, I gained 140 RWHP.

However, I installed the opti along with a cam, AFR LT4 heads, added 33 cubic inches, roller rockers, and more boost. Hope this helps.