1980 Enduro "Steroid Poppin Swede" exhaust and WIP video

Mark Kostyrko, of AutoSpeed's "Steroid Poppin' Swede" magazine article fame is bringing his Enduro out for the first time in a fair while, and is making more modifications. I had the pleasure of visiting Mark and his lovely wife Diana this weekend to meet them and allow us to both acquaint ourselves with each others Enduros.

Would you like to hear a near 300bhp 8-valve B-motor's 3" exhaust note? :D

Enduro Videos

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Steroid Poppin' Swede - Work in Progress on Vimeo

Really sweet 900. I'm guessing these things were factory-built racers for rallying?