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Old 03-23-2010 | 08:31 AM
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houston
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Originally Posted by HBTRAV
g'day mate,
I have been using the 21+4 over here in Australia for about 6 months now i am amazed at the run time and reliability of them (i came from Go tech and Sirio based engines), the engines i am using are box stock, not +4c i was wondering if there are any mods you could do to increase top end without sacrificing much runtime, any reply appreciated

btw i am using 30% and 9901 41021 pipe and header
Switch to a 41005 , 41001 or 41019 header and it will help you out more than any mods .
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