It changes the sound, and it might give a little more power due to being more free flowing.
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While stock diesel systems are very loud they are not the loudest type of exhaust you can get. To get an exhaust that is extremely loud you're going to need to go with the custom or bolt on route.
There are a number of online sites that are known to sell custom cut exhaust parts. The official websites for Walker Exhaust, MagnaFlow, and JCWhitney, for example, sell these parts.
With a custom-made exhaust manifold, a custom tuned PCM, and a lot of patience.
You can start by removing the exhaust baffles. If that doesn't suit you, you can buy custom exhaust or slip ons.
Install a custom exhaust system.
While custom exhaust systems for one's car or motorcycle maybe available locally, one may prefer to shop online for the east of finding one online. If that's the case, one can find custom exhaust systems for cars or trucks at sites such as Car ID, Street Beat Customs, Truck Exhaust Kits, Summit Racing Equipment, and systems for motorcycles are available at Motorcycle Superstore. Also, eBay Motors should have systems for any vehicle.
Start with a custom suspension or better exhaust, then jetting, gear tweeking, ect.
We just replaced our entire exhaust system in a 97 skylark custom 4 cylinder 2.4. It cost us almost $700.
Performance exhausts are usually custom bent and made by most exhaust shops.I have a 1987 olds cutlass and have used the Iroc Z design from the converter back .the muffler is an 80 series Flowmaster .It sounds really nice and it definitely helps the performance.Check in the yellow pages for people who custom bend their exhaust. As far as dual exhaust goes , the flowmaster is a single in and dual out sytle which keeps me emissions legal and gives the appearance of duals as well as the sound also.
This will probably have to be custom built if the company that did the conversion can not provide it.
You need to drop the exhaust to reach the oil filter