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Message: <blockquote data-quote="kenika65" data-source="post: 248397" data-attributes="member: 9282">It is straight forward and plug and play. Bolting on a 325i head, a complete 325i intake manifold, throttle, exhaust, up-grade to 1.3 Motronic and plugging in the 325i engine control unit will bring a 2.7 to life and up to date.I am not familiar with L-tronic injection but think 1.3 is newer and may give better power and less problems, and in an e21 I am not sure if a 1.3 harness will connect to an e21 harness which may be why you have chose L-tronic injection?As for 200hp... in your situation it would call for extreme port, polish head work for starters and you have flat top pistons which will drop your compression with the i head and need a turbo and MS/2 to see 200hp. Then you can get domed 88 super eta pistons which will bring up your compression and make more efficient powerDont fret about taking too much time because it will be worth it when she fires right up!</blockquote>