Online Tools

  • RPM Calculator – Changing your gearbox or diff? Work out your RPM and speed with this helpful calculator

Marlin Sportster and Cabrio Builder Sites

Marlin Sites



  • Frost (Paint Supplies) – Paint and rust treatment supplies
  • Namrick – Get all the replacement nuts, washer and bolts you’ll ever need here. Online order and very quick

BMW Sites

  • M20 Engine – Technical Stuff for the M20 engine used in E30’s
  • – German site on the E30 – very useful for tuning
  • E30 Zone Forum – Excellent forum to source information on your donor BMW. Always someone to help with technical questions! Also new E30Zone shop with lots of E30 related bits
  • E46 Fanatics – E46 3 Series forum based in the USA
  • – Modding forum with several BMW people
  • Planet E30 – BMW E30 3 Series Forum
  • BMW Forum – more BMW
  • – US based technical forum


  • A – Tech BMW – Ant the E30 Tuning Guru and source of chips for the M20B28 conversion


  • BTB BMW Exhausts – BTB 6 Branch manifolds, availalbe through – have a chat with Sal (M5Pilot)
  • Gaz Shocks – For E30 rear coil over conversion. Standard front shocks from Marlin are made by Gaz
  • Magnecor – HT Leads, can cost less that OEM parts
  • Mocal – ThinkAuto – ThinkAuto – the home of Mocal products
  • Magnaflow – Stainless exhaust components
  • Jetex – Build stainless or mild steel exhaust systems from individual components (online ordering)
  • BMC – CDA (Carbon Dynamic Airbox) available from with fitting adapter for the M20 AFM.


Reader Comments

  1. hi i would like to see a video of the stroker sportster
    its a very impressive build and the first ive seen ever, great stuff .
    im also in the process of doing the exact same conversion on my m20

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