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I have a 1986 F150 with the 5.0L V8, 4 speed and i was wondering if anyone had ever replaced their old air box with a new intake set up using an intake pipe straight from the throttle body to a 'performance' air filter. I ask because i am doing just this, but my problem is that the throttle body has 2 pipes to the air box that are both 2 1/4 inches in diameter and the smallest filter/intake piping set up available is 3" in diameter. So, any ideas on how to merge both 2 1/4" pipes into one 3" pipe? Ive done a lot of looking for Y styled pipes, but none of them either fit or are intended for exhaust and as a result cost about 80$.

The only cost effective idea i have had so far is to cut the old intake pipes about a foot out from the throttle body, and shave an angular piece off the end of them then use some heat proof tape/gasket maker to seal them together and fit them into a coupling that will then attach them to a 3" tube that will run to my filter.

It seems to me like this would work quite well considering it sounds like a rube goldberg special, but any advice is appreciated :)
 

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hmm you also need to account for the breather pipe ... and the amount of time and engineering you put into it ... K&N might be a good idea after all
 

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Sorry just noticed how old this post was, geez..

Ive got an 87 bronco with a K&N filter on it. It also has the 2 long air hoses and 2 exhaust pipes cut about 3in to the air filter.

I was thinking maybe you can get some exhaust adapter pipe from 2 1/4 to 3 in or so. They should have those at autozone in the exhaust section, if not you can get it done at your local exhaust shop having them made
 
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