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just wondering is it worth making my own dump pipe? thinkin of using 4 inch pipe or is a 3 inch dump big enough, its just a factory turbo just want the best note and flow from it thanks. oh and who makes the best dump pipe for a td42?
 

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for a standard ht18 turbo wouldnt bother with 4. 3 would be more than enough.
though i did read a post where a guy blew apart a 3 inch pipe. but he is running a pretty high hp setup.
 

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Unless you spent 30 grand on your engine 3 inches is enough.
 
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