Free Stillen Exhaust...?

Red370

thats a full Stillen system, one of the best out there, and can be had for $1200-1300, sounds like you may have gotten yourself a good deal, and yes, so far, the Stillen and FI systems seem to make the most power for our cars. Congrats. And if you think it sounds good now, throw on some HFCs.

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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs

AgStacker

So would cats be the next logical upgrade then? as opposed to say an intake?

Knives

First, congrats on getting a free exhaust. That's awesome.

Secondly, after the CBE is added, the majority of the gains are realized. Seems like adding high flow cats will only net you an additional 5hp or so.
So, if it's between the two (intake or cats) I'd go intake. Plus, there is always emissions, visual inspections and CEL's to worry about with high flow cats (not a big deal, but I factor it in).

But, either way, stay clear of changing the headers. Doesn't add much of anything.

As for tuning, you're good for now. But, if you add the intake and high flow cats, you'll want to get a tune to correct the A/F ratio. You can go uprev or AAM.

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Mods list and pics Click

craniac24

I'm partial to the Stillen Intake. I have it as well as the Stillen CBE and the sound is amazing. I hesitate to get HFCs because most people report rasp issues.

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2010 6MT PG Roadster w/Sport & NAV.
Stillen Exhaust, Stillen GIII Intake, Eibach Springs, H&R Spacers 15f/20r, SPC Rear Camber Kit. Thanks to Vinny Ten Racing!

Red370

thats a problem with test pipes, HFC's with the Stillen exhaust have zero rasp.

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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs