Well ive had my evo 8 gsr for about 4 months now and am planning to do my first round of basic mods anyway here is my current planned exhaust set up.

Map short runner exhaust manifold
Megan racing o2 housing
Megan racing down pipe
Megan racing test pipe
Hks hi power cat back or invidia n1 titanium ti cat back

Now onto my questions,
How much power would i expect to make with this set up with a tune? Are the megan racing parts of high quality and dependable? Would i be better of with ams or invidia or tomei dp and tp? Which cat back sounds best between the hks and invidia? Would this be a loud set up i want it loud but not over the top if u kno what i mean, i am planning on ordering all of my parts from ebay as vendors in nz are very expensive and hav low range of parts, anyway is ordering from ebay a good idea, never ordered parts from there before.

Many thanks to anyone that can take the time to answer my questions. Thank you.

 

All of those sound like good choices. I have friends that swear by Megan as their quality has come a long way. Also a very respectable company I buy most of my parts from recommend megan downpipes. As for their test pipes, I ran into an issue with my setup so I just had to ditch it. It sounded great though as it was the resonated version. As for exhaust choices there are tons of videos on youtube. Good luck with whatever you choose and keep us posted

 

what fuel are you using? also go with a ported buschur 02 housing, i would also make sure everything is a true 3" all the way back. as for the map runner manifold, very good company but very expensive. i would go with a stock ported exhaust manifold from curt brown/stm/buschur dont matter which company.

 

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Cool man thanks on the info, ordering soon but might go with ams dp and tp heard ther better quality. Still not to sure lol

 

Yes there are better quality pieces than the megan unit, but for the price it's not bad at all. If you have some money I would look into the MAPerformance downpipe and O2housing all in one. If I had the money, that's what I would go with no doubt. Also their header is nice, but like lostsoulevo said earlier, a stock ported manifold is cheaper and flows pretty dang well.