Mandrel-bent. TIG-welded. Mirror-polished. Custom exhaust work from the same hands behind New Hampshire’s top mobile detailing studio — built around your vehicle, not a one-size-fits-all kit.
From a single muffler swap to a full mandrel-bent stainless build, every job is designed around your vehicle, your driving, and the way you want it to sound. Quote-only pricing — you get a written estimate before any sparks fly.
Everything from the catalytic converter back — mid-pipe, muffler, and tip. The biggest leap in tone, flow, and presence.
X-pipes, H-pipes, and resonator placement — the secret weapon behind a deep, even tone with no highway drone.
Bring us a kit you bought online or let us source the right one. Either way, you get a leak-free install with new gaskets, clamps, and a road-test.
The detailing-shop edge: tarnished tips brought back to mirror finish, plus optional ceramic coating to lock the look in for years.
What goes under your car matters more in New Hampshire than almost anywhere else. Road salt, freeze-thaw cycles, and 30,000+ winter miles a year separate aluminized from stainless from one-off mandrel work. Here’s how to choose.
The OEM standard. Affordable, quiet, and great for vehicles that spend their winters in a garage or south of the salt belt.
What we put under most New Hampshire builds. Salt-resistant, fatigue-tolerant, and good for two decades under most vehicles.
Full-diameter mandrel bends, TIG welds, and routing built around your engine and chassis. The pick for builds, swaps, and track cars.
Every system on this page is built by hand in our Derry, NH shop. No drop-shipped kits, no off-the-rack hangers, no “close enough” welds. Here’s a quick look at what that means in practice.
Every joint is full-penetration TIG, every bend is mandrel-formed for zero flow restriction. No clamps where welds belong.
Custom routing, polished tips, and a road-test before you get the keys. Built for New Hampshire winters and New Hampshire inspections.
No surprises, no hidden fees. Every Avid build follows the same four-stage process — from the first measurement to the final road-test.
We talk goals — sound, performance, longevity, budget — then put your vehicle on a lift, photograph the existing routing, and confirm clearances. You leave with a written estimate, not a guess.
We size pipe diameter to your engine’s flow, choose between aluminized and stainless, and dial in muffler and resonator selection until the sound profile matches what you described.
Mandrel-bent cuts, TIG-welded full-penetration joints, vibration-isolation hangers, and slip-fit clamps where service makes sense. Every weld is inspected before the system goes back under the car.
Fresh gaskets and clamps, cold and hot leak checks, then a real road-test on highway and back roads to listen for drone, rattles, and harmonics. You drive away with a system tuned by ear, not just on paper.
Most exhaust shops install the system and call it done. We’re a detailing studio first — which means your tips don’t leave the bay until they’re finished to the same standard as your paint.
Tarnished, blued, road-grimed stainless tips get a multi-stage polish that brings them back to a mirror. Then, if you want it locked in, we’ll layer on a high-temp ceramic coating so they shrug off heat, salt, and brake-dust for years.
Tap whichever symptom sounds familiar — we’ll tell you what it usually is and how we’d sort it. No guesswork, no upsell.
Tap a chip above to get a one-line diagnosis and a recommended fix. Still not sure? Text a tech and we’ll listen to a 10-second voice memo.
Cracked manifold, blown gasket, or a rotted mid-pipe. We’ll trace the leak, repair or replace the section, and confirm it’s sealed before delivery.
Almost always a flange gasket, donut, or a hairline crack at a weld. Quick to find with a smoke test, quick to fix with new gaskets.
Rubber hangers stretch and snap, heat shields rust at the spot welds. Both are inexpensive fixes — the rattle disappears with new isolators.
Drone is a resonance, not a defect. We tune it out by re-locating or upgrading the resonator and adjusting muffler chamber geometry.
Sulfur smell means the cat is sintering or contaminated. Direct-fit replacement, sensor check, and a quick OBD scan to confirm.
Could be the cat itself, or a lazy downstream O2 sensor. We confirm with live data, then replace only what’s actually failed.
If it’s a single section, we splice in mandrel-bent stainless. If it’s everywhere, full stainless system pays for itself in NH’s salt belt.
We pull the exact codes, isolate the failed component (cat, sensor, or leak), and put it right so the next inspection is a pass.
We listen to your car at idle and at WOT, then build up from the quietest mod that hits your target tone — without crossing into illegal volume.
Most “too loud” complaints solve with one extra resonator and a properly-sized chambered muffler. Cabin gets back to highway-conversation level.
Everything we get asked most often about timeline, NH inspection compliance, sound, and the difference between a section repair and a full system.
Send us your vehicle, your goal, and the sound you’re after. We’ll come back with a written estimate — usually same-day — and a clear next step. No obligation, no high-pressure sales.