hmm.... well, I agree to an extent.

1) MAFS before the supercharger in front of the bumper is a terrible idea. Idle surge if those filters are not 100% blocked. Temperature difference is significant that if not tuned properly, your going to get varying results and can damage your engine. As far as I have read, people have blown their engines with Stillen's default tune. The 350z HR does not even have speed density tuning capability due to the lack of a MAP sensor. So this kit gets difficult to tune. A lot of "Correction" and "fudge factoring".

2) Their tune sucks. They should reduce it 500 dollars and make it a "tuner" kit... because I had to tune several times already. Probably a good 1,200-1,500 just in tuning fees.

3) The cable issue... which is F'n annoying as HELLL. I replaced BOTH throttle bodies trying to diagnose this. So, $600.00 more out of my pocket. Also sent it to a shop for vac/boost test...found nothing. another $240 for diagnostics. Replaced the bypass valve, another $200. So, instead of coming out and admitting that their cables suck, I'm down more money diagnosing their shitty cable, their shitty tune, and their shitty MAF design.

Lets put it this way. When Apple got caught slowing down phones, forcing users to upgrade, i switched to Android. Apple is dead to me. Yeah... Stillen is on my $h1t list.

Don't know what to say man. Sucks you are going through this. Maybe go to a different shop? My shop, with Uprev, did the tuning once and it has been fine ever since.

Ok here are the pictures of my engine bay. The insulated wiring in the Red outline, that's what you need to have. Obviously this is only a picture of whats on the top, not sure about other wires buried deeper.

Wide view:
https://i.imgur.com/Vlj30Xf.jpg

Left side:
https://i.imgur.com/p478pG7.jpg

Right side:
https://i.imgur.com/vDA6Typ.jpg

Seb was the last person I got my tune from... after 2 shops. It's been good so far. Just this Idle problem.

Awesome! Thanks. Looks like they cut the OEM harness and extended the wires.

np man. post up on if you can replicate my setup, and how it turns out

Im having the same trouble as well.

I recently had this problem pop up on me after I had been running the SC set up for about 4 months/3000 miles. I cleared the code, turned the car off for a couple minutes and turned it back on and the problem was resolved. It happened about 3 weeks later and I cleared the code and turned the car off and on to solve the problem. I thought that the problem might have been the Stillen TB wire extensions were being pinched from the steel fuel line inlet into the fuel rail (the Stillen instructions have you bend the fuel inlet line near the pulsation damper and redrill the hole on the mounting bracket. I followed directions and although nothing seemed pinched, it was still tight).

I have the Topgunz SC kit which included the three Stillen extension cables (two long cables for the MAFs and one short one for the TB). Because of the location of the MAF in Topgunz's kit, I only needed to use one of the long cables and the short cable for the TB. I swapped out the short TB cable and have been using the long MAF cable for the TB connectors. Both TB and MAF connectors are identical. It has only been two weeks but no problem yet.

Did you try using the OEM cables instead? Or, similiarly, make sure that every cable was very well insulated? End to end, the entire chain, wrapped up to its *** in sleeves, rubber, plastic, or all of the above

I found that the top maf extension is pinched in between the blower intake and the rad support, pinching the wires on the piping. So I have to take off the whole bumper to fix what may be my problem. Besides that, everything seems fine...
I got the car already SC’ed so I have to backtrack the install to fix a ghost problem.

Michigan Motorsports MAF Mass Air Flow 24 inch Extension
 

Has anyone used these michigan maf extension cables , they are $20 on amazon. Hopefully it will fix the maf and tb extension issue without stillens bs ?

I just ordered one for the tb since im getting the cel and limp mode like everyone.. i'll update after install and let you know if it fixed it .

is it this one?
https://www.amazon.com/Michigan-Moto...omotive&sr=1-1

Yeah that one , is it good ? Has anyone used it yet ?

I have the Gen 2 Stillen MAF cables for $20 with free shipping too.

I just looked looked at the Michigan Motorsports extensions. They are 5-wire extensions. You could not use them to connect to the TB since the TB connections are 6-wire. All of the Stillen extensions are 6-wire so you can use any of the three that come with the kit to extend to the TB.

I will say, however, that I have tried all three of the Stillen extensions to connect to my TB and at some point or another all three have hit me with the P1239 code.