{"product_id":"rlv-b91mo-modified-class-silencer-1-5-16-inch-open-modified","title":"RLV B91MO Modified Class Silencer - 1-5\/16 Inch - Open\/Modified","description":"\u003cp\u003eUnrestricted exhaust flow is the lifeblood of high-RPM 196cc clone engines, and integrating \u003cstrong\u003enew parts\u003c\/strong\u003e from a premier \u003cstrong\u003eonline kart store\u003c\/strong\u003e is the fastest way to unlock that hidden horsepower. The RLV B91MO 1-5\/16\" Modified Silencer is engineered specifically for open and modified class racing, where stock limitations are left in the dust. By utilizing a high-flow square-hole baffle design, this silencer drastically reduces exhaust backpressure, allowing your GX200 or 196cc clone to breathe freely and accelerate harder out of the apex.\u003c\/p\u003e\n\n\u003ch2\u003eIntegrating Exhaust Dynamics with Your Go Kart Chassis\u003c\/h2\u003e\n\u003cp\u003eWhen you push beyond the factory rev limiter, every component must work in harmony. The 1-5\/16\" mounting diameter is perfectly sized for modified 4-cycle headers, ensuring a seamless transition of exhaust gases. A poorly matched exhaust can cause harmonic vibrations that resonate through your \u003cstrong\u003ego kart chassis\u003c\/strong\u003e, leading to premature fatigue of welds and mounts. The RLV B91MO mitigates this by offering a secure, slip-on fitment that, when paired with a heavy-duty worm gear clamp and safety wire, withstands the brutal harmonics of a modified 196cc engine at full tilt.\u003c\/p\u003e\n\n\u003ch2\u003eBalancing Power, Grip, and Steering Components\u003c\/h2\u003e\n\u003cp\u003eHorsepower is useless if you can't put it to the ground or control it through the chicanes. As this silencer shifts your powerband higher, the increased top-end speed demands more from your chassis setup. Just as a mechanic meticulously selects \u003cstrong\u003eparts for tires\u003c\/strong\u003e to maximize mechanical grip, you must ensure your \u003cstrong\u003esteering components\u003c\/strong\u003e are dialed in to handle the aggressive corner-exit speeds this exhaust profile provides. It's not just about making noise; it's about tuning the engine's volumetric efficiency to match your track's specific layout.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications \u0026amp; Track Compliance\u003c\/h2\u003e\n\u003cp\u003eThis is a purpose-built racing component. It is significantly louder than the standard RLV 4104 and is \u003cem\u003enot legal for stock classes\u003c\/em\u003e (such as AKRA, NKA, WKA, or IKF stock divisions). It is the definitive choice for Limited Modified, 14.5ci Open Modified, and Super Stock classes where maximum flow is prioritized over decibel reduction.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Flow Square-Hole Baffle:\u003c\/strong\u003e Maximizes exhaust gas scavenging for improved high-RPM horsepower.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1-5\/16\" Inlet Diameter:\u003c\/strong\u003e Precision-sized to slip over standard modified 4-cycle header pipes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight Steel Construction:\u003c\/strong\u003e Weighs approximately 0.9 lbs, keeping your overall kart weight optimized.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAggressive Exhaust Note:\u003c\/strong\u003e Delivers a tuned, resonant sound profile indicative of a high-compression race engine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVibration-Resistant Mounting:\u003c\/strong\u003e Designed to be secured with a heavy-duty clamp and safety wire for endurance racing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModified Class Specific:\u003c\/strong\u003e Engineered exclusively for open, limited modified, and Tecumseh Star (10HP) racing divisions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat-Cycled Durability:\u003c\/strong\u003e Resists the extreme exhaust gas temperatures (EGTs) generated by heavily modified clone engines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eStop leaving horsepower on the table with restrictive stock mufflers. Equip your racing program with the RLV B91MO and experience the throttle response and top-end pull required to dominate the modified ranks.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the RLV B91MO silencer legal for my local stock class?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e No. This silencer is specifically engineered for open, limited modified, and super stock classes. It is not legal for standard stock divisions like AKRA, NKA, WKA, or IKF stock classes due to its high-flow design and increased noise output.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I ensure this silencer stays secure during a race?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Because modified engines produce significant harmonic vibrations, we strongly recommend using a heavy-duty worm gear clamp to secure the silencer to your header. Additionally, always use safety wire to prevent the silencer from vibrating loose or detaching during high-RPM operation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will this fit my standard 1-5\/16 inch header pipe?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the B91MO features a 1-5\/16 inch inlet diameter designed to provide a precise, slip-on fit for standard modified 4-cycle header pipes. Ensure your header pipe is clean and free of debris before installation for the best seal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this silencer require any engine tuning?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes. Because this silencer reduces exhaust backpressure and shifts your powerband higher, you may need to adjust your carburetor jetting or clutch engagement to match the increased volumetric efficiency and top-end speed of your engine.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/exf5007-rlv-clone-thick-flange-header-959-id-exf5007\"\u003eRLV EXF5007 Thick Flange Clone Header with 0.959 Inch ID for Power Gains\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/5434-rlv-thick-flange-clone-header-j-style-5434\"\u003eRLV Thick Flange J-Style Clone Header for Robust GX200 Performance\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/5435-rlv-clone-gx200-wide-power-band-j-style-header-5435\"\u003eRLV Wide Power Band J-Style Header for GX200 Clone Engines with Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/wkas1516-silencer-stock-class-1-5-16-model-b91xl-most-popular-stock-class-muffler-wkas1516\"\u003ePopular RLV B91XL Stock Class 1 5\/16-Inch Silencer\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/5417c-restricted-classes-bottom-and-mid-5417c\"\u003e5417C Bottom and Mid Exhaust Header for Restricted Kart Classes\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SwiftKarting","offers":[{"title":"Default Title","offer_id":48158025482499,"sku":"WKAM","price":54.77,"currency_code":"USD","in_stock":true}],"url":"https:\/\/phishstonesproducts.myshopify.com\/products\/rlv-b91mo-modified-class-silencer-1-5-16-inch-open-modified","provider":"PhishStones Products","version":"1.0","type":"link"}