4.9L 300Ci. I6 4x4 Exhaust Experiences?
Hello everyone, my name is Eric, and I am new to this section of FTE. I just bought a '94 F150 XL 4x4 5 speed manual with the 4.9L 300Ci I6. I am looking to really wake her up, but am having no luck with my research on google, summit, jegs, or with the search tool on here. So I am looking for experiences from people who have this motor, and have modded their exhausts.
What I am looking to do is build a custom exhaust, starting with the header back.
Thanks for all your help in advance, Eric |
On an I-6 first thing is to get a hi-flow cat and muffler, hope this helps
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So you think that I could just go ahead and skip the headers all together?
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is it 2.25" piping that our trucks are running?
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I would skip the headers, and add a k&n air filter. 2.25 sounds right on the pipe size. remember this cat and muffler was IMHO overkill on these trucks.
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Thats a relief, because thats more money I can spend on the CAT and muffler. Im good with choosing the muffler, but do you have any suggestions on which CAT I should go with? ...It may sound stupid, but which air filter are you talking about? Where is it located? Ive done a couple of exhausts on my previous vehicles, but never messed with any air filters related to them...???
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K&N air filter (think intake side). Magna flow or comparable for the cat, the exaust wont help much unless the engine can take in the air it needs.
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Ok, I see where your coming from. So just a dual-in single-out cat should work pretty well? or am I going to need to buy 2 separate ones? (The stock headers have dual outlets correct?)
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Dual in single out should work fine, i dont feel, u need more than one cat on the truck. it should be dual outlet header pipe
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Your 94 already has a split manifold. I would not bother with headers on it. It doesn't move that much air and is a lower reving motor anyway. I would get a high flow cat and run a good straight through muffler like Magnaflow or Dynomax SuperTurbo with 2.5 inch single exhaust.
Keep your stock air box and intake tube its a great setup and already pulls in cool air. Stick with a good OE type air filter like Motorcraft, Wix, Purolator etc. By the way stay away from KN CAI, TB spacer, snake oil spark plugs etc. |
Yeah, the carbed guys feel like the struck GOLD when they find a FI 300 and snatch the manifolds. Keep em, run a good Y pipe to a single high flow cat and high flow muffler of your choice. I ran a gutted cat and a Flowmaster 40 out the side before the rear tire and it sounded AWESOME and the truck ran great!!! Good luck!
Matt |
ok well... where do you live??? If you live in a state that does the emissions testing then go with a high flow magnaflow cat... if you don't (i know someone will raz me for saying it but...) delete your cat! I have a I6 in my 88 f250 and have deleted the cat and ran 2 20in "glasspacks" off the headers into a single 2.5in exhaust. it breaths really well and the i6's aren't that loud without the cat (depending on muffler of corse). I agree the headers aren't worth buying and stock was done just fine. Get a cold air intake from K&N for a couple hundred bucks and the i6 will be able to draw much more air. google "K&N 57-2503" this is the non mass air setup so if you have MAF you'll need a different one...
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63-1014 is the K&N part number for newer 4.9L motors... evidently both are with out MAF sensors so you just have to keep your MAF metter plumed in if you have one...
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Check out the straight six forum on here. On the top, there is a sound click thread that let you listen to what people have done with there I-6's!
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Originally Posted by itsasix
(Post 9274251)
Yeah, the carbed guys feel like the struck GOLD when they find a FI 300 and snatch the manifolds. Keep em, run a good Y pipe to a single high flow cat and high flow muffler of your choice. I ran a gutted cat and a Flowmaster 40 out the side before the rear tire and it sounded AWESOME and the truck ran great!!! Good luck!
Matt |
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