As for Brenspeed, they are a reliable company. I haven't heard any real complaints. Check out some of the site sponsors as well, they offer discounts to members if you pm the sponsor and they all have good prices.
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2006 V6 auto with the pony package
adding to it everyday
I like to spread out my purchases between sponsors as much as possible. I have ordered many times from Brenspeed and been very pleased each time. I don't know of any promo coupons but you'll be happy you did business with them.
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66 Coupe Tahoe Turq - 200, Pertronix & Flamethrower, 3 Row Rad, Cliff. 6/2 96 GT Vert Laser Red - FMS pulleys, Bullet ProM, BBK CAI, Prof. Prod. Elbow and 70mm TB, MAC Off-Road H, Borla side exhaust, Tokicos, B&M Ripper, 18x10 & 18x9 DD Bulletts 06 GT Tungsten, UIP, Red Leather, Stick, 18" blades, Steeda CAI, SCT XCal 2 w/ MC Racing 91 tune, MACs, BMR SP010 springs, BMR Adj Panhard, CDC ducktail & quarter louvers, Rear louver, painted black stripes
I've been happy with Brenspeed. Heck I bought 1 measly cat back muffler for my wife's V6 and Brenspeed threw in a bunch of stickers, a refrigerator magnet and a "Pypes" t-shirt. I will defintely shop there again.
FYI Brenspeed has a huge e-bay store, they're usually a little cheaper there. Save ya some $$$
I've also had great luck with Americam Muscle, RPI, CDC, BMR and a couple others. Haven't had (knock on wood) a bad experience with any vendors yet.
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wife; 2006 Pony, manual trans, center fog grill, Pypes catback, quarter window louvers, BMR lowering springs, adj track bar, DRS pony emblem, 10" stripes, mycolor, factory GT wheels, brakes and suspension, FMC hood scoop, GT500 splitter, rocker stripe delete, smoked turn signals, FIA/Shelby stripes.
me; 05 black GT. manual trans, Shaker 1000, NSP stainless axlebacks, FIA/Shelby stripes, Pro 5.0, Cervinis window scoops.
Ive ordered thousands of dollars worth of stuff from Brenspeed, great prices, free shipping and great customer service. With any vendor theres chances of hicups with very large multi peice orders, in my experience with them they have always made things right in these situations, thats why i always check their site first when looking into a purchase. The techs are also very knowledgable and they give you free tune revisions when you buy new gear that needs an update.
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2007 GT Convertible Premium 5 spd || FRPP HotRod Cams || Full Steeda Suspension w D-Specs || Brembo GT500 || Steeda CAI & Delete plates|| Flowmaster || Magnaflow catted X Pipe || MGW Shifter || Tuned by RealSpeed ||
I just ordered my SCT X3 from Brenspeed and paid to have expedited , well there was a mix up and they didnt I see the extra money I paid for it to be expedited, I emailed them and they assured me that it would be going out soon , I called them the next day to find out more information, they told me they are sending next day air, got the tracking number and conformation later that day , now thats what I call great customer service. I would buy from them again in a heartbeat, customer service is number one with me!!!
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2007 ( Vista Blue ) GT"BUSTER " 2-5-08 See Profile for mods "As I would not be a slave, so I would not be a master. This expresses my idea of democracy. Whatever differs from this, to the extent of the difference, is no democracy." Abraham Lincoln
Brenspeed Coupons 
I would buy from them again in a heartbeat, customer service is number one with me!!!
