Complete Guide to Vehicle Modification Laws in Kansas

Kansas gives car enthusiasts a lot of room to customize their rides, but there are still specific rules worth knowing before you start wrenching. The figures, statutes, and exceptions in this guide were verified against primary statute text (September 2026), so you can treat this as an accurate snapshot of current Kansas law. Below, we break down the most common modifications — from lift kits to underglow — so you know exactly where you stand.

Lift Kits

Status: Legal

Kansas doesn't impose a statewide lift, frame-height, or bumper-height limit, making it one of the more lenient states for suspension work. The only real constraint is that your vehicle must stay within the general overall-height cap — there is no separate statewide height limit specifically for lifted vehicles. Keep in mind that general equipment rules still apply after you lift your truck or SUV, including proper headlamp height and functional lighting. There's no dedicated statute addressing lift height modifications directly; the relevant code section is K.S.A. ch. 8 art. 17, which notably contains no height-modification section. Check out lift kit laws for more detail.

Window Tint

Status: Conditional

Kansas tint law is refreshingly simple: front side windows must allow a minimum of 35% VLT, and both the rear side windows and back window must also meet a minimum of 35% VLT. That means every window on the vehicle — front, rear, and back — shares the same 35% VLT threshold. This rule is codified under K.S.A. 8-1749a. Before you get film installed, check current shop specs against these numbers to avoid a citation. Full details are available on the window tint laws page.

Headlight & Taillight Tint

Status: Illegal

Smoked or tinted film on headlights and taillights is not permitted in Kansas. The law requires headlights to emit white light and taillights to show red at the required visibility distance — film is not allowed under any circumstance, and any tint, cover, or alteration that reduces light output or dims/discolors these lamps is a violation. This applies broadly, with Kansas prohibiting any tinting, covering, or alteration of headlights and taillights that reduces light output or visibility. The controlling statutes are K.S.A. 8-1705 and 8-1706. If you're considering smoked lens covers or colored film for a stealth look, this is one modification to skip in Kansas — see headlight tint laws for the full rule.

License Plate Frames

Status: Conditional

Kansas law draws a hard line on plate covers: any covering material, whether clear or opaque, that affects visibility or reflectivity is prohibited — clear covers are not exempt just because they're transparent. Starting July 1, 2026, the rules extend to frames as well: a frame that hides the plate number, state name, or registration decal becomes a violation, though enforcement will be warning citations only through December 31, 2026. At all times, the plate number, state of issue, and the registration decal's month and color must remain visible. Frames themselves are fine as long as they don't cover or obscure any part of the plate, including numbers, letters, or registration information. This is governed by K.S.A. 8-15,110 as amended by SB 403 (effective July 1, 2026). For the complete breakdown, visit license plate frame laws.

Underglow

Status: Conditional

Underglow lighting is legal in Kansas — including while actually driving — but it comes with real restrictions. Any light visible from the front must be white or amber, with no red visible from the front; light visible from the rear must be red; no flashing is allowed; and any beam over 300 candlepower must be aimed within 75 feet. Kansas specifically reserves red and blue colors for emergency vehicles, so those are off-limits for underglow, and flashing or strobe patterns are prohibited outright. Lights also can't be positioned so they're visible from the front or rear in a way that could be confused with required vehicle lighting. This is regulated under K.S.A. 8-1729. Enthusiasts wanting a color-changing setup should double check their controller settings against these limits — more info at underglow laws.

Wheel & Tire Protrusion

Status: Legal

If you're running wide wheels and tires, Kansas has good news: there's no fender-coverage, mud-flap, or wheel-protrusion statute for ordinary passenger vehicles. The only reference in the code, K.A.R. 36-1-31, applies solely to special vehicle combinations, not everyday cars and trucks. That gives builders considerable freedom on fitment. See wheel and tire protrusion laws for the source regulation.

Aftermarket Exhaust

Status: Conditional

Swapping your exhaust system is perfectly legal in Kansas, but the replacement must include a muffler in good working order. Cutouts are prohibited, meaning bypass valves or straight-pipe setups that let exhaust escape unmuffled are not allowed. Additionally, catalytic converter removal is prohibited under federal law on vehicles originally equipped with one. In short: the muffler must remain functional and prevent excessive noise, the catalytic converter must stay intact, and no cutouts, bypasses, or straight pipes are permitted. This falls under K.S.A. 8-1739. Visit aftermarket exhaust laws for the complete rule set.

Light Bars & LED Lighting

Status: Conditional

Kansas allows up to two each of spot lamps, fog lamps, auxiliary passing lamps (mounted 24–42 inches high), and auxiliary driving lamps (mounted 16–42 inches high). No cover is required on these lamps. There is a cap of 4 front lamps over 300 candlepower lit at the same time, and any lamp with an intensity over 300 candlepower must be aimed within 75 feet. These rules come from K.S.A. 8-1719, 8-1728, and 8-1729. If you're planning a light bar setup for off-road or auxiliary use, make sure your total count and mounting heights fall within these figures — see light bar laws for specifics.

Exhaust Noise

Status: Conditional

There's no statewide decibel limit for passenger cars in Kansas, which gives exhaust builders some flexibility. That said, a muffler in good working order is still required, exhaust can't produce excessive or unusual noise, and cutouts or bypasses remain prohibited. This is covered under the same statute as exhaust systems generally, K.S.A. 8-1739. Check exhaust noise laws for the full picture.

Window Banners

Status: Conditional

Kansas permits sunscreening strips along the top of the windshield only, and this strip may not extend below the AS-1 line. The material must be non-reflective and cannot be red, yellow, or amber. Because the law requires this material to be transparent, a printed or opaque banner is not legal — only a clear tint band along the top of the windshield is permitted. This falls under K.S.A. 8-1749a. If you were hoping to run a printed windshield banner at a car show or track day, it won't pass muster on Kansas roads — see window banner laws for details.

Lowering

Status: Legal

Just like lift kits, dropping your vehicle's suspension is unrestricted in Kansas — there's no suspension, frame-height, or bumper-height statute governing how low you can go. Enthusiasts building a slammed show car or a lowered daily driver won't run into a specific statutory limit here. See lowering laws for the current status.

Every modification above links to its full law page with exact limits, statute citations, and exceptions — or browse every Kansas 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.