[m98f150]

I was reading a article in a magazine that had a 2004 f150 4.6l 2v with a airaid intake and slp exhaust installed and had to have 2% fuel added at wot because it was to lean I was told the 2004 and up do need fuel added and the older trucks can have more mods before needing more fuel at wot My truck is a 1998 f150 with 4.6l v8 2v and has bbk shorty headers, dynomax muffler in place of the stock muffler, gotts mod, iceman intake tube and a edge programer and wanted to know if anyone has any experiace with a truck with similar mods and if so was it running lean at wot also would it be a good idea to add 2% fuel to match what was done in the article ?

the article has base line at 197 hp and 258.5 tq afr 12.2:1
with air box and tube 207.6 hp and 268.9 tq afr12.4:1
slp exhaust 205.9 hp and 262.2 tq and afr12.8:1
tune with 2% fuel 212.7 hp and 269.3 arf 12.3:1
thanks

[Longshot270]

There is a difference with the commercial intake and the gotts mod. With the aftermarket intakes, the pipe diameter increases around the MAF sensor letting more air to get in than the computer knows to compensate for, causing the lean conditions. If you still have the MAF sensor in the stock surroundings then you will be fine.

[JackandJanet]

^^^ What he said, and, I don't think your truck has the "lean" problem regardless of the type intake you install. This problem really surfaced with the 04+ model year.

- Jack

[m98f150]

I thought it would be fine but just wanted to ask. I was told only the 2004s had the problem but just wanted to be safe my truck runs good just worried about leaning it out after reading the article. thanks.

[Longshot270]

Yeah, I also think the newer ones are more likely to run lean because of the emission standards, less chance for failure on the sniffer test if they aren't running on the rich side.