Hybrid Fever said:Ok a couple things.
1. I honestly think that the atmosphere is fucked up because of planes and other large vehicles(buses,semi's,construction vehicles) that don't have to pass smog. Not all of the everyday other cars on the road. Well maybe the muscle cars that get like 3mpg.
2. Have you ever looked inside of a cat? It's a bunch of fuckin catalyst honeycomb shit in the way of the exhaust flow. How's that for turbulence and losing power. Let's start from the the exhaust ports. Ok, air is coming out, flowing nicely through the primaries of the header, and then BAM a fuckin wall of catalyst honeycomb. Sounds like some restriction and turbulence to me. I personally have a gutted cat and it sounds like shit, but it feels less restricted. It was a carsound high flo to begin with and I gutted it out one day; you wouldn't belive how much bullshit came out of it. It does sound like shit and I don't notice a whole lot of gain from it, and miss how my car used to sound, but it was free and gave little gains. I think a straight pipe would be the best bet because it's a straight path all of the way through.
Ok , it is so funny how people only want to read and take what they want from it!
1-I never said that a semi was less harmful to our air, then a civic with a hollowed cat or a stright pipe. I said, we have laws in place because people are irresponsible and take the mentality of its free or its cheaper then what is right. Not that a stright pipe is any worse then a 18 wheeler, just that if everyone pitches in and helps and does not take the attitude of oh well it is free or cheaper. thus why laws have been put into place, to try and fix or prolong the effects of all the shit we put into the air.
2-Ok, Unless you put your car on the dyno, you could never feel gains(whether it be positive or negative). Yes you are right, the shit in the cat is very restrictive, but it has been designed in a way that has the best possible flow velocity with the least amount of restrictions. When you gut that shit out, you leave rigid areas and it is not straight through. These rigid areas, create turblance and reversion, that the car's exhaust never intended or was designed to have, thus creating a loss in power. THis is why a gutted cat is a not so good idea. Your preception of more power is an illusion. For example, people that have a a CAI on their car and then buy a huge TB, think they have gained power, due to the butt dyno feeling a little better throttle response, but in reality they have lost. Unless you strap a car on the dyno you will never really be able to tell an accurate difference just by driving.(unless you have added a turbo or something to that extent.)