So I have the 3.9L V6. I want to put a CAI on the car but all of them say 3.8L. I only have one vacuum tube on my stock intake and there is not an additional sensor like the 3.8L after market CAI have. If I bought one could I just plug the additional hole in the CAI up? If not where can I get a CAI for my model?
my 03 3.8 had the same situation.. but the cai i bought came with a plug for that second hole since my motor didnt come with a sensor there.. u could probably talk to whoever sold you the cai and theyll set u up with a plug for it maybe.. what CAI do u plan on getting/do you already have?
I was going to just get and eBay special. I have looked the the BBK,K&N, and Steeda and honestly I really dont see a difference. What would you recommend?
You can plug it. My 2001 only has one one vac tube and no temp sensor. I just used a large bolt and silicone sealer. I haven't had any problems so far.
As for the different brands, I would go with the eBay special. With name brand you are just paying for the name. All CAIs are a large filter attached to a length of pipe with a mount for the MAF in the middle.
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'01 Silver V6 5-Speed Show:17x8 Anthracite Bullitts w/Kumho 255-45s, spoiler, smoked headlights and fog lights, black LED 3rd brake light, Mach1 grill delete, Mach1 chin spoiler, splash guards, Hurst badge, chrome exhaust tips, carbon fiber bumper inserts, 8" antenna, black hood stripe, 232 badges, Ford Racing license plate frame (in the box: hood scoop, rocker stripes) Go: Divorced dual exhaust w/Original 40's, AM CAI, Hurst shifter, SCT 91+ Tuned
yeah.. theres no real difference.. if it doesnt come with a plug.. then just make one.. im sure youll figure something out they all work the same.. u just have to make sure air isnt entering behind where the maf can detect it
I was going to order the BBK CAI from American Muscle. Then I noticed it was 99-03. Does this need modification to fit the 3.9? Not trying to hijack the thread but I would like to know the answer to this question too.
I was going to order the BBK CAI from American Muscle. Then I noticed it was 99-03. Does this need modification to fit the 3.9? Not trying to hijack the thread but I would like to know the answer to this question too.
Giezr
Get the cheap model from AM. There is no need to spend more than $70 for a CAI since they all perform the same.
i used to have a cheap one and it worked just as good as a bbk. The extra money you pay for a name brand is for the name! Esp when it come to stuff like this.
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'97 with built 3.8 from Supersix
Tma turbo kit
448hp @15psi 11.09@124mph
XXXhp @21psi 10.71@125mph
Fastest Single Port V6 Mustang w a Ported Stock Upper Intake
Oh. That makes sense. I was wondering why the hole was there bc the pipe bend on the 94-98's were different......
yeah it really doesnt make a lot of sense because i see CAI's advertised as fitting 99-03, but i've heard people with 01's, 03's, and 04's all say their MAF and IAT are not seperate.
therefore since i have a 2000 and mine are seperate i assume it must be 01+...
I contacted BBK and K&N both and there reps did not recommend for the 3.9L due to the sensor. I asked around from other 3.9L's off this site and spent the extra bucks for the MAC Performance 73mm Mass Air System. Fit perfect and nice I-Candy. No plug to fill. Everything hooked up just right and felt the little extra hp. Not bad. I was told by MAC performance it would add about 13HP compared to their fenderwall CAI. First mod and the experience is what I got most out of it. Good luck in your endeavors....
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2004 V6 3.9L Premium
MAC 73mm Mass Air Intake System
Use RP 5W20
Duals with H-pipe and Flowmaster 40's
CAI on a 2004 Mustang V6 3.9L 
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