Check the option parts that ETS Champion in stock class Alexandre Duchet from France has been using at his XRAY T4. Alexandre explains also the benefit of each part, for which track conditions they should be used and what performance improvement you will experience.
#302063-K T4 Alu Adjustment Ball-Bearing Hub
>>> I use this hub because the alu hubs reduce friction and make the car to run freer. Perfect for the stock class. The alu hubs are stronger and more reliable with best life span.
Composite C-Hub for Body Upstop - 4° Deg. - Graphite #302383-G Right #302384-G Left
>>> I use these upstops when I need more steering and better steering response.
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#301961 T4 ULP Graphite Shock Tower Front 3.0mm - Low
>>> I use the ULP shock tower because it allows me to mount the shock lower by 4mm. The car has improved steering response. I recommend it for technical tracks
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#305309 ECS BB Drive Shaft 53mm
>>> I use this ECS BB drive shaft 53mm because it reduces friction between driveshaft and outdrive. It Increases the corner speed and it is really good for the stock class.
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#305242 Drive Shaft Replacement Cap 3.5mm
>>> I use these caps because they are made of extra strong composite which increases wear resistance, lifespan and lowers the friction.
