Nope, I just ordered the smallest one from McMaster Carr and it works great. The site Do It Yourself Water Injection gives complete step by step instructions, a complete parts list with numbers, and where to get everything. Couldn't be much easier. The only drawback I can see is if you use the denatured alcohol/distilled water mix ( that's what I use and it works best, but I've even used windsheild washer fluid!) it ends up costing about $7 a gallon, but it lasts quite awhile, considering your only on boost for a few seconds at a time. Check it out. Mike If you want you should start a new thread under the performance/modify section and we can continue this discussion there.