I am needing to know what is better the h-pipe or the pro-chamber? Is the h pipe set-up the same if I cut off the cats and just welded new pipe in it's place? I have already spent 140.00 in my flowmaster super 40's and 65 to have installed with tips. I don't want to have to spend a lot more to get the sound I want!! can anyone tell me the cheapest way to get a VERY AGGRESSIVE sound with out emptying my wallet, and what all I need to do? I have also been told that i need to buy some kind of adapter for my o2 sensors or my check engine light will stay on. Plus if you can tell me the cheapest place to buy whatever you recommend? I just am really tired of looking at all kinds of set-ups and still scratching my head and still not knowing what I should still do. Any suggestions are appreciated and welcomed. Even if i haven't asked all the right questions I would like to hear any extra info on the the best (loudest and cheapest) way of approaching my problem with a solution. I don't mind spending the money if I need to, to get the sound i want but like I said before I am not made of money and would like to keep the cost down without putting off-brand crap!! I want quality stuff but for cheap. If you know anyone that can help I will be gladly to give you my phone number so I can get better info on this. If you happen to have a sound clip of the examples that would be great!!!! Use to all I had to do to my vehicles was add an after market muffler or two but now everything has gotten so complicated that I am PULLING MY HAIR OUT trying to find a proper solution. PLEASE HELPP!!!