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ZFG > all…it’s just the way it is. 5 Star shouldn’t even be on your list.

You would order the tuning device and tune from ZFG and install it yourself via laptop. It’s a very simple process with plenty of support to walk you through the process.

I’ve always felt like it has to have some effect but tons of IC’s come painted so I guess it’s negligible.

You’ll get it…Covid and supply chain issues are affecting everything. I’ve waiting 5-6 months on backordered car parts over the last year or so.

If you just want some sound you can have any muffler shop swap mufflers for a fraction of the price. You won’t gain any power from either Borla kit.

Here’s mine with the grille shutter slats removed.

Unfortunately your a Borla exhaust didn’t add anything buy sound. It’s the same size as oem. And you don’t need a HPFP to run E50….just a tune for it.

Many of us have done what you’re doing now…the results have been consistent across the board as far as improvements with certain mods. 4.0’s generally on 93 with stock exhaust. 3.9’s after DP’s on 93 and 3.70’s on E50.

No 93 tune on the planet will do mid 3’s….not happening. It takes downpipes and E50 on top of everything else. 4.0’s will be your bottom end.

I don’t add anything at all. Everything you listed or could list can be had cheaper and better after purchase.

With the right adapter rings stacked up possibly? I’ll try to remember to measure when I swap my new ones in.

Do what?

I run 37 cold in my 315’s. I always chalk my tires and let that tell me what to run. Websites are just generalizations.

Yes

Late build 21’s have the bypass valve disabled in the ECM.

Bought the 8WM’s today…I guess the upgrades are starting already.

Either of those are substantially more shallow than the midbass I run now. The 8WM has a small neo magnet and the C8 has a completely inverted motor.

It’s a quality tune you won’t have any issues with. Not the most power you can get but a damn nice increase.

Absolutely. I’ll likely be changing to a Focal 8WM or Illusion C8 soon.

You can’t blame your lack of due diligence on what other mfg’s do. You didn’t look…that’s on you.