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Message: <blockquote data-quote="ICEMAN 68" data-source="post: 551203" data-attributes="member: 17">for the RPM flactuates  cause could be from a tiny air leak OR to a clogged throttle body ,icv, maf etc etc ...but all i could think right now is that it's due to your non catalylic converter which had some how reduce the back pressure....well you may not need a C.V unit  but instead get a so called " bullet" to replace the C.V ...if the pipe is just a straight weld hence cause you're loosing some back pressure and bare in mind you're running on auto and not manual ...i've been running with a straight pipe without a C.V hence cause me to loose some backpressure upon a sudden acceleration...and worse still my engine started to develop some sort of knocking sound at times which likely to be a faulty knock sensor .... as for the manual conversion cost : well depends on how much you buy those manual box as some can fetch as high as 5K to a low mid 2K ...sold off mine at mid 2K...and as for the installation it will be around rm500 ~ 1K ...</blockquote>