Complete Guide to Vehicle Modification Laws in New Mexico
New Mexico gives vehicle enthusiasts plenty of room to customize — from lift kits to underglow — but several categories carry specific conditions you'll want to understand before you start wrenching. The figures in this guide were verified against primary statute text (September 2026), so you can treat the numbers below as accurate as of that check. Read on for a category-by-category breakdown.
Window Tint
Status: Conditional
New Mexico requires a minimum of 20% VLT on front side windows, and the same 20% VLT minimum applies to rear side windows and the back window. Darker limits can apply behind the driver on some larger vehicles.
For SUVs, trucks, and vans, the rule differs slightly: front side windows still need a minimum of 20% VLT, but MPV, bus, and RV windows located behind the driver are exempt from the tint requirement.
Full details are on the window tint laws page. This rule is governed by NMSA 1978, § 66-3-846.1.
Aftermarket Exhaust
Status: Conditional
Swapping your exhaust system is legal in New Mexico, but the state requires a muffler in good working order, and cutouts or bypasses are prohibited. Notably, there's no statutory "no louder than stock" standard — instead, the law is built around avoiding excessive or unusual noise.
Keep in mind: catalytic converter removal is prohibited under federal law, and straight pipes or cutouts are not allowed under the exceptions listed for this rule. See the aftermarket exhaust laws page for more, under NMSA 1978, § 66-3-844.
Headlight & Taillight Tint
Status: Illegal
New Mexico does not permit any film on headlights or taillights. Headlights must emit white light and taillights must show red, and any covering, coating, or tinting material that reduces light output or dims/discolors those colors is prohibited — no exceptions are listed for this rule.
Check the headlight tint laws page for the full text, covered under NMSA 1978, §§ 66-3-804 and 66-3-805.
License Plate Frames
Status: Conditional
Frames are allowed as long as the whole plate stays visible and legible — plate covers are not allowed. The plate must also be kept free from foreign material that would obstruct or obscure the plate number, letters, or other required registration information.
More detail is available on the license plate frame laws page, under NMSA 1978, § 66-3-18.
Window Banners
Status: Conditional
Sunscreening is only allowed at the top of the windshield — not below the AS-1 line, and not more than 5 inches from the top, whichever is closer to the top. It must be non-reflective and cannot be red, yellow, or amber. Because the material has to be transparent, a printed or opaque banner does not meet the standard — only a clear tint band is legal.
The banner also must not obstruct the driver's view of the road or traffic control devices. Visit the window banner laws page for the complete rule, under NMSA 1978, § 66-3-846.1.
Wheel & Tire Protrusion
Status: Legal
New Mexico has no fender, mudguard, splash-guard, or tire-protrusion requirement. The only applicable obligation is the general duty to keep your vehicle in safe operating condition.
See the wheel and tire protrusion laws page, under NMSA 1978, § 66-3-801 (general equipment duty).
Light Bars & LED Lighting
Status: Conditional
New Mexico permits 2 spot lamps, 2 fog lamps, and only ONE auxiliary driving lamp (in the 16–42 inch range). That single auxiliary driving lamp must be switched off within 500 feet of approaching vehicles. No cover is required for these lamps, but a multi-lamp bar setup falls outside what's permitted under this category.
Learn more on the light bar laws page, governed by NMSA 1978, §§ 66-3-827 and 66-3-835.
Lift Kits
Status: Legal
There's no statewide lift, frame-height, or bumper-height limit in New Mexico. The only relevant cap is the overall vehicle height limit of 14 feet. General equipment rules — like proper headlamp height and working lighting — still apply regardless of lift height.
Visit the lift kit laws page for more, under NMSA 1978, § 66-7-404(A).
Underglow
Status: Conditional
Underglow lighting is legal in New Mexico, including while driving, but it comes with color and flashing restrictions: no red visible from the front, no flashing, and blue is reserved for emergency vehicles.
Check the underglow laws page for full details, under NMSA 1978, § 66-3-835.
Lowering
Status: Legal
New Mexico has no statute limiting how low a vehicle may be lowered. As with lift kits, general equipment rules — proper headlamp height, working lighting, and nothing dragging on the road — still apply.
Since there's no dedicated statute cited for this category, be sure to keep your setup compliant with the general equipment standards referenced elsewhere in this guide. See the lowering laws page for more.
Exhaust Noise
Status: Conditional
New Mexico sets no statewide decibel limit for passenger cars. That said, a muffler in good working order is required, exhaust may not produce excessive or unusual noise, and cutouts or bypasses are prohibited — the same standard that applies to aftermarket exhaust systems generally.
Full details are on the exhaust noise laws page, under NMSA 1978, § 66-3-844.
Every modification above links to its full law page with exact limits, statute citations, and exceptions — or browse every New Mexico mod law in one place, free.
Disclaimer: This guide is for informational purposes only. Data is AI-extracted from public statutes and may contain errors. Always verify with local authorities.