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:confused:01 f150 4.2l had to cut cats out. cats had backed up and cracked the heads and block. i put a new motor in and it drained the bank. now my millage has gone to nothing i have lost over 100 miles to a tank. is there a cheep fix to getting my milage back other than putting the cats back in. if anyone could help me that would be great
 

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Get you some high flow cats from magna flow. Cheap, like the cost 60 bucks a piece and will help you by not throwing a code. It's a win win, will make your truck louder and run better.

On the programmer diablo sport will probably be your best bet. I don't know of many, if any programmers made for the 4.2l
 
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