My husband: Great quality, perfect fit, very bright. For MY Terrain unfortunately, these LED rear turn signal bulbs worked, but flashed very quickly as when a conventional bulb is inoperative. This is the same for the front amber turn signal bulbs for my Terrain, whether installed only in front, or only in rear, or used together as designed. Both AUXITO and Brightstar have great products, accurate listings and fitment. There is no way to know if the bulbs will work properly with your vehicle(s) electrical system without actually trying them. For MY Terrain, the ONLY LED bulbs that did not work properly are the front and rear turn signals. This is also the same bulb for the Parking lights. ALL other lights have LED: high and low beam, backup, license plate, side markers, and all interior, dome, map lights, and sun visor vanity mirror bulbs (you can actually use them now!). The normal turn signal bulbs still blink plenty bright enough to fit fine with the rest of the LED bulbs. The LED difference in all other locations is almost literally night and day in every position: low and high beam, interior, license plate, and backup are outstanding. Approaches the performance of my front headlights HID system on my 1995 Camry with glass headlight housings. You will wonder how or why you never tried them previously. On many cars, the level of difficulty to install will always be different. Some positions are easy, some are not. On the 2011 Terrain, both front LED headlights and side marker bulbs will be difficult for most people. See my review on LED headlight installation for 2011 GMC Terrain. The LED turn signal bulbs front are easy, with rear and all other interior lighting positions also easy on the 2011 Terrain. I will report back on consistent light output and longevity results.
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