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Old 04-01-2010, 02:10 PM   #1
Eddy@APEXraceparts's Avatar
Join Date: Oct 2009
Location: Bay Area CA 94551
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My Ride: E30 M3, 540i/6
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Thumbs Up AST Coilover kits: 4100 & 4200 series -NEW LOWER PRICES- //APEX\\ is an official, Authorized AST Suspension dealer, and we carry their full BMW suspension line on our website for easy checkout with prices listed and free shipping.
Contact us if you have any specific fitment questions via PM, e-mail or phone (press 0 when calling to be directly transfered to me).

AST officially announces new pricing on complete 4100 and 4200 kits which include shocks, struts, springs, ride height adjusters and other hardware. As of April 1st, prices have dropped from $2549 to $1899 for a complete 4100 kit and from $3329 to $2899 for a complete 4200 kit.

APEXs NEW 4100 kit price: $1849 plus FREE shipping
Click HERE to order

APEX's NEW 4200 kit price: $2849 plus FREE shipping
Click HERE to order

APEX's NEW 5100 kit price: $2779 plus FREE shipping
Can be upgraded to 5200 or 5300 on the product page
Click HERE to order


The 4100 Series shocks introduce high performance monotube technology at prices competitive with twin tube insert coilover kits.
They include purpose built strut and shock bodies, shortened from stock lengths.
They are single adjustable (rebound only) and can be custom valved for your application.
4100s use the same internals as our 4300 Competition shocks.

APEX Price: $1849



The 4200 Series shocks use ASTs Twin Piston Dual Adjust (TPDA) technology.
Similar non adjustable versions have been found in the highest forms of racing.
TPDA builds on this technology to allow for 2 adjustment knobs to be mounted on the shock body (no tools required).
Quick rebound and compression changes can be made in the pits in seconds.
4200s are fully customizable and rebuildable.

APEX Price: $2849


Single, Double & Triple Adjustable versions

5000 series: These are an inverted strut design, which makes for a very stiff strut assembly, providing better suspension geometry under heavy lateral and braking loads seen in a road course environment.
They are available in single, double, and triple adjustable versions, and can be modularly upgraded from the base 5100 series to the 5200 or 5300 by simply purchasing the external reservoir attachment.
This provides an upgrade path for customers on a tight budget.

APEX Price: $2779


Why Buy AST USA Shocks - The Four Ps

Besides tires, SHOCK ABSORBERS are the most important parts on your car.
They need to be perfectly matched to your springs, your driving style, and your car overall.
Piston size
Before AST, there were constant compromises when shopping for shocks.
When you choose AST USA, you can have the best in all four areas and create a performance oriented package that you know you deserve.


Consider what you get with AST products and the value for your money becomes self evident.
All levels of AST shock absorber are hand built using brand new, custom housings.
Even with the Performance Grade 4100 series, you are getting the internals of the 3 way shocks in a single adjustable (rebound only) coilover kit.
Competitiors at or below AST prices simply do not offer the same high technology and features.


AST shocks are monotube design for a reason; they perform better. When will you notice this?
Big bumps in turns and fast transitions on the track / autocross course are where true premium shock performance becomes evident.
Ride in or drive any car with this level of shock and youll know instantly why people buy them, they make the difference.
Other non-monotube designs on the market exist for two reasons: comfort and cheaper manfacturing expense.
These are two things can do without when time on the track counts!

Piston Size

AST's monotube design translates into a bigger piston.
When you put AST shocks on your car, you know that those big pistons can handle much larger loads.
This translates directly into the ability to fine tune your shock.
Other shocks that use twin tubes have much smaller pistons; and that means less ability to handle performance loads and less flexibility when it comes to adjustments.


All of our shocks are pressurized to a minimum of 175 psi with nitrogen.
High pressurization keeps the oil from cavitating around the AST piston.
Cavitation makes the shock ineffective, pressurization makes a consistent environment for the shock to do its job correctly with every stroke.
Other lesser products (and even some more expensive ones) say they are pressurized, but they may be only
14 -29 psi - not something you need on your mind when approaching the next curve.
When you choose AST, you know that with each and every bump and hard corner, your shocks will be there to meet the challenge with superior design, pressurization, and value.

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