Hi,
I’ll address some of the bases..
One concern being is how casual the RMV is regarding inspections where you live.(?).
The volume of these FI systems will have a difficult time producing volume to maintain boost levels that’ll flow anywhere near the capabilities of these heads.
Nothing wrong running TrickFlow 170’s w/ 2.02/1.60 Heads, or AFR’s,..But since you're now compressing the mixture, the stock heads aren’t bad at all.
What are you running for a T.Body?
Long duration blower Cams would add more for gains, if your interested. Pricey. too. The best NA Cams make the worst FI Cams. Why? Overlap.
The valves leaking the precious boost right out of the chambers running typically selected Cams with medium overlap will cause that. If you want a bit more zip, I’d opt for gears. Absolutely the best bang per buck.
3.73’s or 4.10’s will feel like a 75+ HP NOS shot vs stock gears.
Trade off is highway driving mileage. It’s not terribly different, with 5th gear having an 0.68 ratio in your Trans. If you plan long highway trips, I’d opt for 3.73’s, if it’s random highway driving & mostly cruising, 4.10’s.
Ford Racing gears @ LMR...
https://lmr.com/products/mustang-gear-ratio-to-rpm-chart
I’d posted a link for a gear ratio calculator below to see what your car will rev at with different gearing in each gear. Just plug in your #’s....
Parts from LMR including gears, install kit, axle bearings run about 400$. Installed by a good shop specializing in transaxles, it’s between 300-450$ to completion. The Achilles Heel of the 8.8” rear is the axles. Otherwise, it’s stronger than a GM 12 bolt & weighs less. If desired, that’s another 125$, submerged install cost if installed W/gears.
If a loud exhaust is what you seek, that’s easy, but everybody has their own taste. You can jump on American Muscle where they have sound clips of many systems..even YouTube which has every exhaust a proud Ponyowner has posted.
Real loud & sounding great, losing the “drone”, I’d suggest looking at SLP’s Loudmouth,
Borla’s Stinger,
Pypes Pipe bomb, Roush extreme, there’s so many others. Take a peek (and listen) for yourself...
AM......Try & stick to Stainless.
Shop 1999-2004 Ford Mustang Exhaust. Hand-picked by experts! Pay later or over time with Affirm. **Free Shipping on Orders Over $119**
www.americanmuscle.com
If You’re also running the fuel pump that came with the kit, I’d supplement the pump with an in-line Boost A Pump, or swap for a Walboro 190-255.
https://lmr.com/item/KB-89069/Kenne-Bell-Boost-A-Pump-Single-40amp
The pumps that come with the Procharger (just) barely keep up with 39lb injectors. I’d also suggest a triple pillar mount Wideband 02 sensor A/F mixture gauge, temp gauge, mechanical oil pressure gauge, out of the way— but crucial for keeping tabs on things..
You’ll need to have your Car re-tuned by adding these, but Longtubes will improve flow on the exhaust side, where you most need it. Shortys require no tune, 02 sensors in the same spot as stock. Bolt up to stock exhaustThey also don’t flow as superb. For FI, they’re not bad.
Hope that helps, for now.
-John