From Gude's webpage:

"Gude Performance/Bullfrog products are for off road use only and may never be used on any public highway. Gude Performance/Bullfrog does not meet any expressed or assumed fitness for any particular purpose. Due to the nature of the sport of racing and/or high performance applications, or the manner in which they are installed or used, there is no warranty expressed, implied, or assumed to the purchaser. It is the sole responsibility of the purchaser and installer to determine the specific fit or usage of any Gude Performance/Bullfrog product. Gude Performance/Bullfrog, shall not be liable for any special, consequential, or incidental damages, including but not limited to: loss of profits or revenue, bodily injury, and/or loss of life. Gude Performance/Bullfrog will not be liable for towing, replacement, or repair cost for any part damaged, or any labor charge which might arise from the usage of any items in this catalog or any product produced or supplied by Gude Performance/Bullfrog."

Doesn't mean you will fail emissions, but they're not saying your going to pass either.