Planning an Exhaust Build, I mean DownPipe build

[GSLENK]

I never think about exhausts because I hate loud. But being a monster every now and then is ok, especially if its during monster power... So I got to thinking... Stock exhaust w/ cutout. Where would it go? the cat duh. so i could swap it out if i had to. That means I HAVE to swap for emissions though (if i dont historic register) and for only ~$70 more i could have a 3inch DP instead of a test pipe... hmmmm

So Heres My Final Design (with my setup so far):
Stock minifold (get it, MINIfold hahahahahah)
to stock o2 housing
to 3in megan racing DP with y-split and E-cutout with turndown
to factory cat + exhaust.

no farty stinky car either.

Now for my questions (current mods/goals at bottom):
1) O2 HOUSING- I assume the 3in DP will match the o2 housing. Will this be sufficient for my future goals? Do they make bigger o2 housings to accomodate "bigger" 3in DPs or are all 3in DP the same pretty much?

2) CUTOUT WHERE - where should the cutout go? Pre-flex pipe (you know the braided wire part) or after it? Should it matter performance wise since it obviousley has to be after the bend from the o2 housing. Im leaning towards before, but i want room for my wideband 02... so maybe after?

3) My INNOVATE WB o2. I figure since im fabbing stuff up... Might as well put the WB where it belongs, so maybe it will last longer in a DD. 3ft downstream of the turbo is ideal right? how far in front of the cut out? I dont want the atmosphere oxygen messing with my readings. I guess this sort of ties into #2.

4) any room for improvement? I want this taken care of now before I start buying stuff and cutting/welding/cursing.

5) The CAT. Im sure i will have a fun time getting this to match my cat... get it reduced to 2.25" and flanged?

Heres on what i plan on getting:
Quick Time Performance QTEC30 - Quick Time Performance Electric Exhaust Cutouts - Overview - SummitRacing.com
Quick Time Performance 10300 - Quick Time Performance Exhaust Cutouts - Overview - SummitRacing.com
EXTREME PSI : Your #1 Source for In Stock Performance Parts

I want the stock system to stay in so i dont scare females away, and once they get in, I can floor it, and they will scream like in Death Proof, that tarentino flick.

My current setup has the free mods, wbo2, boost gauge, MBC.
My immediate goals will be to put in either a big 16g, or a fp green, and eventually a HX35 or 40. I want the 16g or FP sometime within a year. Bigger will probably be a lot later.
All supporting mods will be done first, this being one of the first. (ill have some fun with each step, maxing out the 14b)

 

[DSM Jeff]

If you're keeping the stock manifold and stock o2 housing I would look into porting them if they aren't already. The megan down pipe I believe is 2.5" into 3". Most aftermarket o2 housing will be 2.5" at the bottom. You can open the stocker up. I'd put my wideband before the flex section. I do this incase it ever starts to crack, at least the readings won't be affected. Your cut out can be where every you feel you can fit it. Your best bet is to aquire the parts. If you want to keep your cat you can do it before and shorten the downpipe or put it after. To have parts mate up you can pick up nice reducers from Summit as well as flanges. Just measure what you're starting with and finishing with and find the appropriate parts.

 

[schroder]

I'm late too, but for placement, try to place it where the downpipe takes a 90* bend. It removes any restrictions in the exhaust and doesn't hinder flow...it just comes straight down and out if that makes sense. But just an FYI, its been proven on here that a full exhaust does better on our cars than an open dump downpipe. Its been a while, and I dont care to search because its not my car...but something to look into. There are also plenty of ways to get a full 3" exhaust and have it remain relatively quiet. Like with a resonator or 2, a magnaflow high flow cat, and a good magnaflow muffler. Again, just food for thought.

Oh, and as for scaring the females away...you drive a plymouth laser. Except women who don't care or women who know what your Laser Turbo is, its not exactly a panty dropper. Just sayin

 

[GSLENK]

nah.... not too late. Im still in the thinking process. I have too much school and work right now to do much else, besides, Im probably gonna be broke until i get a tax return

This is a near future mod, I gotta do some more maintenence first... like TB shaft seals. @#$!&%

 

[GSLENK]

Ok maintenence out of the way... Need help choosing A downpipe, just noticed PR are cheaper.

Do megan racing and Punishment racing both bolt up to the factory o2 AND cat converter? (im pretty sure its a yes to the o2, but for my purposes it must bolt up to the CAT)

Also I read reviews where the PR DP hits the transfer case, I assume this is with mis-matched o2 housings only and not the stock config?

Anyparticular one worth their differences (megan=ease of installation, higher price, reduced to o2) (punishment= harder install, lower price, not reduced as much)