DEMOTRONIC
Quiet at the office. Demonic at the redline. The D.R.P. house-brand electronic valved muffler — hand-welded T-304 stainless with a wireless butterfly-valve controller. One product. Universal fitment. The loudest switch you'll ever flip.
One press. Total transformation.
Butterfly valve blocks the outer exhaust chambers. Air routes through the baffled inner core — civil at idle, refined at cruise, daily-driver legal.
🔇 Click to hear it
Butterfly disc rotates 90°. Exhaust gas bypasses the inner baffles entirely and exits straight through the outer chambers — full unbaffled roar, head-turning note, track-day character on demand.
One muffler. Two modes.
Closed at cruise. Uncorked on demand.
Electronic butterfly valve sits between the inlet and the outer chambers. Closed = whisper-quiet OEM-style note. Open = full unbaffled exhaust roar. Toggle from the included wireless key fob, in real time, on the move.
T-304 stainless. Hand-welded. D.R.P. engraved.
Hand-built in our shop from T-304 stainless steel. Every weld inspected, every chamber pressure-tested, every shell laser-engraved with the D.R.P. demon. Boxed in a custom black presentation case with the controller + harness + remote.
Universal sizing. Custom-built per car.
63 mm inlet matches most aftermarket and OEM mid-pipes. Dual 51/63 mm outlet plate fits common quad-tip and dual-tip layouts. Tell us your Make + Model + Year and we confirm cut-in length, hanger position, and tip orientation before fabrication.
One muffler. Every mood.
Made-to-order T-304 stainless. Wireless valve control. D.R.P. demon engraved on every shell. Universal fit — we confirm cut-in length, hanger position, and tip orientation before fabrication.