If you have the cash and don't mind the wait time, FI is definately the way to go. I've been running the rhfcs for years without a single issue. I ran them initially with stm short tails. They're now paired with FIs full exhaust. With the short tails, it was loud, but maneagable. You will piss off your neighbors in the morning. With a full exhaust, you can have a conversation in the cabin without yelling.

I leave before most of my neighbors wake up, so I'm sure most of them don't even set alarm clocks because the just consider my cold start all the alarm they need.

It would be nice to have a conversation once in a while I guess, but getting rid of the rasp is my main concern. I actually put a different axleback on my car 2 days ago that had bigger resonators on it, but the cold start was just as loud. The cruising drone was less though. I like the way the AAM Short Tales look and sound better, though, so I switched back.

If I go with Fast Intentions, should I get the High Flow Cats (HFCs) or the Resonated High Flow Cats (RHFCs). I see on their website they only have the RHFCs for sale, but I heard the used to make non-resonate ones. I'm sure I could find some if I look hard enough.

Well FL has no testing sites and no emission requirements for registration....I'm going to do whatever the fuq I want to my car until that changes. Cops don't care at all down here from what I've seen. Never been pulled over and I've had cops sit behind me for like 5 minutes in traffic and I know they could smell my car....because all the prius drivers give me dirty looks. :rofl2:

The FED is corrupt as all hell anyway from top to bottom, I don't give a shiz about their mandates or Orwellian 1984 rules.
"Rules for thee, but not for me"...pfft shove it.

Those who sell or install devices to defeat emission controls can be fined over $4,800 per defeat device, and dealers can be fined over $48,000 per tampered vehicle. In 2019 one diesel performance shop was fined over a million dollars. Though its very rare that anyone actually gets fined ever, a disgruntled costumer can make threats and scare a shop to just stop doing it for awhile.

It has happened to several folks in the Diesel industry. That crap started back in 2007 when particulate filters were introduced. I can remember a couple of companies that went out of business.

If you are quite about it, you probably won't have any issues. If you are disrespectful, loud, and obnoxious like above, The the EPA will rain hell down on all of us.

Gov starts over stepping its bounds and becomes too authoritarian, freedom loving patriots get loud about it usually.

Steve Dinan was on The Smoking Tire Podcast and he was saying that you don't need to remove the cats!

Unless referring to a racing application, no one should be arguing there is a need to remove the cats. Of course there's no need. There are pros and cons to removing them. Each person's end goal and level of risk aversion is going to determine whether removing the cats is the right decision for them.

Personally, I think test pipes are too loud for certain types of street driving. But I like the smell of gas, so I chose to live with the noise.

My HFC + motodyne combo is honestly perfect. It's hardly loud when driving normally, but it will make noises when i get on the loud pedal. Combined with running E85, hardly any smell.

I hate the smell of raw fuel. E85 makes it so much better. It burns so much cleaner too.

No need to remove them but if your car is boosted there would be a need to move them downstream more. My mil spec cats are in the lead pipes

Interesting, I'm the opposite, I can't stand the smell of gas. My old 350, that I bought used, had the cats removed and the smell of gas really got to me sometimes. My current car has resonated HFCs and it's a bit louder than I would prefer but I'm used to it. And, it wasn't worth the cost of new cats to swap them out...lol.

You guys don't know what real gas smells like. Back before the 80's. You could get 98 octane from the local gas station pump. And every car didn't have cats on it. Every heavy truck rolled coal. 2 stroke motorcycles mixed with bean oil. That's a smell that you will never forget. :tup:

I wish cars burned the castor oil. Loved the smell of Klotz