christian370z & speedworks, thanks for your responses and advise. Since then I have read the entire FAQ section on Swift's website and the other earlier thread on the forum (up to page 6 so far) and have come to the conclusion that I will stick with the OEM struts since most of their R&D is based around the tuning the spring to work in conjuction with OEM strut. This post with an email from Swift sold me on their product (well along with the info on their website).
From Swifts website under the FAQ section:
Swift Springs USA "You won’t have to change out your shocks (unless if you want to) to compensate with our Sport springs. It is truly a plug and play part for your performance vehicle".
Here is the post from the other thread.
SWIFT Springs in Production
Sold!
Anyone want to buy two sets of really good performing Eibachs. Will be up for sale once I have the Swifts installed on both Z's. I will be letting them go for a really low price to recoup the cost of Swifts.
Christian, the stance looks great!