At Buku we pride ourselves in knowing that we produce the highest quality and best performing products. If you are having difficulty with your Buku Power Exhaust System then we encourage you to call (1-877-BukuPower) or email tech support. However, if you decide that for any reason you do not want to keep the Buku Power Exhaust System then simply return it within 30 days of the original purchase and we will refund 100% of your purchase price.