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I had a H&R spacers added to my rear and they came with flat headed bolt to accommodate the length. They don't make the Porsche, dimpled bolt for that length. You should ask them what size spacers were put in.

If you are not happy with SP, I recommend Bilstein PSS9 Coilover system so you don't need a separate coil. The ride is fantastic, performance solid, and you can make 9 way adjustable.

Thanks for your comments. Here are better pictures comparing before and after.

Hello Everyone, While this is my first posting, I have been a fan of this forum for relatively long time. For the past several months, I have been modifying my 2006 997 C4 Cab, and I want to thank you all for giving me ideas on what to do with my car. I thought I would share with you what I did and hope this posting will be useful for those who are about to embark on their own projects. This is my third Porsche from Carlson Porsche in Northern CA, and all of my work was done by Alex and James of Shark Werks in Freemont, CA. These guys are great! They are knowledgeable, experienced, and their work excellent. They have been great advisors for me putting up with my pestering and questions. I think they got into this since they don't do much 997 C4. • 997 C4 Cab, PASM, Sport Chrono, Bose High End, Bi-Xenon, Nav PCM: I liked the thought of AWD and, while it’s not as pure as a coupe, convertible outweigh getting the C4S coupe for my need. Purely street. • GIAC software. I like the upgrade, including remapping the engine for 91 Octane since that’s what I find in CA. Certainly gave me a better TQ mid and high range you can feel on a highway. • EVO V-Flow: I like the cold air concept and engine seems to like the match with GIAC. • B&M Short Shifter: For few hundred dollars, this is the best investment in making the car more enjoyable to drive. What Porsche puts in, with plastic parts, don’t compare to what B&M does. • IDP Plenum: I read and re-read all the opinions on Plenum, but I looking at the plastic T that comes in the car and the aluminum Plenum won over. After few hundred miles, I can hear and feel the engine “sucking” up the air. It feels right. • HRE 19” Comp wheels: I love the way this wheel look, but more important it’s much lighter (love those titanium fasteners) and the ridges on the back wheels give them more strength especially if you are driving pot hole streets of SF. • EVO Headers and Tubi Exhaust system: Tubi is very personal since AWE and Fabspeed all sounds great. James told me not to change the cat since their experience was for the engine light to go on. Tubi is about 60% the size of OEM, much lighter and beautiful. This system is quiet until you open the car up. Music to my ears. On cold morning, it starts with a BARK! • Brembo GT Big Break Upgrade: This new generation Monobloc aluminum system upgrade is 6 pistons 355x32mm in front, 4 pistons 345x28mm in the back and much lighter than OEM. The difference is it doesn’t catch immediately, but then, “bam!” you stop smoothly. No squeaks. • Bilstein PSS9 Damptronic Coilover PASM Kit: When I drove the OEM suspension with PASM on, as soon as I hit a bumpy road, the car bounced all over the place. With Bilstein, it feels more planted to the road. It’s stiffer, so on pot-holed streets, it’s not very enjoyable, but on good road, you can feel how stable and taut it is. Lowered 1.50”. • LWF: Single mass, light weight flywheel. Wow, it revs up fast, and revs down fast. Lighter than the double mass, and the response is awesome. Only problem is under 2,000 rpm, it rattles so just keep the rpm up. The Tubi exhaust sound raspier with LWF and Alex told me more like the RS! • H&R Sway Bar and spacers: The solid sway bar verses hollow OEM really keeps the car flat to the ground when switching lanes especially at high speed. • TechArt front spoilers, side skirts, steering wheel: Purely personal. Yes, for the money I put in, I could have bought a turbo, but I didn’t expect to go this far and just fell in love doing this project. With the weight saving (around 100 lbs.) and little more HP/TQ, it’s just a blast to drive on the Pacific Coast Highway with the top down! Sure Having Fun.