Yeah, it's either that or pay the shipping....they get it either way.

 

I bought the horns for $19.99 and the special oil filter wrench http://www.amazon.com/gp/product/B00...ef=oss_product for $7.99 and got free shipping.

 

I, too, was unimpressed with the anemic horn... So, I got some horns off of a '74 Cadillac ($10 bucks ea.) at the local junkyard. There's a 'low' note, and a 'high' note. I put one on the right side frame horn, and the other where the existing horn was. For 'weatherization', I put dielectric grease in the butt connectors and shrink tubing on the connections. I really like the early GM sound that they put out, plenty loud, too...
Mo

 

So your HHR now sounds like a freight train

 

I do have my remote set to not honk 'em, don't want to scare anybody. They sure are effective to get slower drivers out of the fast lane, though.
Mo

 

"I bought the horns for $19.99 and the special oil filter wrench http://www.amazon.com/gp/product/B00...ef=oss_product for $7.99 and got free shipping."

There ya go....make their system work in your favor.....it's the only way to go...(:

 

I installed a Wolo Bad Boy. Small, self contained air horn with integrated compressor that easily mounts in the stock location with a single bolt. You'll have to increase the fuse size on the horn circuit.