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I am running ZFG 93, noticing a huge difference in exhaust burble behavior with E30 in the tank. Not overly concerned about it, just wondering why the E30 makes so much more noise at parking lot speeds. A full tank of 93 (E10) hardly burbles at all. Bonus question: any technical reason to avoid...

Bought these on the forum and never put them on. Like the previous owner, decided to go with H&R's. $280 with free shipping, will ship to anyone in U.S. The previous owner sent these in an H&R box, and I will be sending in the same box. Verified these are the correct springs with Steeda support...

Anyone running a Thermal 3" having problems with the midpipes backing off of the stock downpipes? I've re-tightened several times, and most recently got it to the shop to have the bolt torqued to hell. The "nipple" on the stock downpipe is causing quite a bit of vibration when the pipes back off...

Having trouble lately launching aggressively in sport mode. With the colder weather, the vehicle seems to be launching much harder than it was in the summer, which is great, but my transmission is cutting off or something during first or second gear. My gearing icon disappears completely, and it...

Driving around normally a few days ago, I noticed an awful ping/creak/scraping sound coming from the very back of the vehicle. It is hard to hear from the outside, because it only makes noise when the exhaust is HOT. This can be from 10 mins of regular driving without stopping or a solid pull...

Hi, Has anyone installed FenFab catted downpipes with their Thermal R&D 3" exhaust? I recently put the new Thermal 3" on, it was a downpipe-back system with improved flex sections from the OEM part. Will the Thermal flex pipes bolt up to the FenFab downpipes without any issues? I noticed the...

Hey everyone, Planning on tuning the ST in the near future. I have never tuned a vehicle before and am having trouble understanding the difference between the two tuners that ZFG offers. I plan on doing an initial tune and 1-2 revisions. What can the MPVI2+ do that the RTD+ can't? What would be...