Charger / Challenger Scat Pack tune. Nashville.
The 6.4 Hemi 392 in the Scat Pack is a naturally aspirated platform that responds well to tuning — easy 30+ wheel hp on Stage 1 with 93 octane. Long-tubes + intake territory is where it really starts to show its potential.
Every Carma tune includes.
Real prices, no dyno-number runaround. Here's what comes with every flash — at no extra charge.
What we do for the / challenger scat pack.
Stage 1 on the 6.4 optimizes spark and fueling across the RPM band. Stage 2 with long-tube headers, off-road mid-pipe, and cold air intake is where customers see real returns — 580+ wheel hp at the crank is the norm with the bolt-on path mapped correctly.
The 392 is the last great naturally aspirated Hemi, and tuning it is spark-and-airflow discipline rather than boost math. Like every 2015+ Dodge it ships with a write-locked PCM — the unlock is one-time, done in-house, and included in the Stage 1 flow. The 8HP70 automatic responds to calibration almost as much as the engine, and MDS four-cylinder mode can finally be told to sit down.
- Factory file pulled and archived (free stock-revert anytime)
- Custom-mapped for your exact mod combination
- Safe map flashed and road-tested in-house
- Cam-swap mapping covered for built engines
- Lifetime support on revisions
Pricing for the charger / challenger scat pack.
Mods we pair with this tune.
NA Hemi mods that actually pay, in order:
- Long-tube headers — the 6.4’s single biggest unlock — remapped spark to match.
- Cold-air intake — modest alone, additive with headers and the map.
- 8HP70 calibration — firmer, faster, smarter — transforms the car more than peak numbers do.
- E85 blends — ethanol spark on the NA Hemi; fueling scoped per build.
- Drag radials — 392 torque deserves traction. Cheapest ET drop available.
No dyno-number games, no hard sell. Drive it, and if the tune isn't for you, we revert to stock at no charge. That's how confident we are in the map.
Common questions.
Does the 6.4 need PCM unlock like the Hellcat?
No — the 6.4 PCM is not write-locked. Standard ECU flash, no unlock fee.
Stage 1 vs Stage 2 difference?
Stage 1: 30–35 wheel hp on stock. Stage 2 with long-tubes + intake: 75–110 wheel hp. Cam-swap builds push well past 580 wheel hp.
What octane is required?
93 octane minimum for Stage 1 or 2. The 6.4 pulls timing aggressively on lower octane.
How long does the appointment take?
Stage 1: 2–3 hours. Stage 2 with parts to install: full day.
Can you turn off MDS (four-cylinder mode)?
Yes — banished entirely or confined to gentle cruising, your call. Most Scat Pack owners choose banished, and the car drives noticeably more consistent.
Auto vs manual — different tune?
The engine map is shared; the 8HP70 automatic additionally gets shift calibration (worth it every time), while manual cars get rev-match and torque-management cleanup.
Is E85 worth it on a naturally aspirated engine?
Blends still buy real spark headroom — less dramatic than on boosted cars but honest gains. We scope your fueling and map to a blend you can actually sustain.
Book your Charger / Challenger Scat Pack tune.
Drop it off in the morning, drive it home tuned by end of day. 1035 3rd Ave S, Nashville, TN 37210 · Mon–Fri 8 to 5.