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Originally Posted by Hobbs
Man, I got to do some research....
For starters, what I was planing on doing was adding this flowmaster cat. back system for $400.00 http://www.flowmastermufflers.com/pr...oducts_id=3710
But what you are telling me:
"I've seen systems for the big blocks on www.summitracing.com, www.jegs.com probably has them too. Same as mine, they're 2 1/4" pipes, all hardware, but no mufflers. I think they're about $125 or so. If you want true duals, and can do it yourself, this is really the way to go. Add some converters and Flowmasters to it (if I had to do it again, I'd have waited until I had the money to buy everything), and the h-pipe from Summit, and you've got yourself a nice system for around $350."
Is that with a little work, I could create a true dual with or with out a cat. for around $350.00.
1) Get the dual system from some place like summit
2)add a high flow cat. (side point, I am supprised about the ebay price, I quickly searched them the other day...around 240.00)
3) flowmaster muffler
Another question....Will changing these newer emission tuned engines to a dual exhaust with or without a cat. change the tuning of the engine? Will I create other problems by converting the exhaust system?
After some research, I may have more intelegent questions. 
Hobbs |
Doing the catback is fairly easy, probably a lot easier than doing true duals, all depends on how rusty your manifold studs are. My studs were rusty, and very thin. Knowing they would break, I saved myself some torture and just broke them off, and drilled them out. That was a pain, but the rest of the install was very easy. If you think you could handle having to drill out studs, go for it!
In my opinion, the dual 2 1/4 setup flows more than the stock system, based on the area of a single 3" pipe vs. the area of two 2 1/4 pipes. Is it necessary? Maybe not, but I did feel a difference in low end torque, and higher RPM power. Plus, I'm one of those types that would rather replace a worn stock item with a performance oriented aftermarket part. May as well upgrade!
The Flowmaster system is nice too, because all the pipes are mandrel bent, and you're getting a high flow muffler.
If it were me, I'd be going with the dual system, and a little more elbow grease to get it done. All depends on how much work you want to do.
As for the emissions tuning, you shouldn't have an issue at all. I'm guessing that you're worried that the increased exhaust flow might make mess up the fuel to air ratio? I know on carbed engines, it was a common practice to change jets, or idle mixture, after freeing up some airflow with an exhaust or intake (did this myself to many cars). On our Suburbans though, the O2 sensor and computer does have the ability to correct for airflow changes (as long as we're not installing a 6-71 blower!
).
So, you won't need any tuning, chips, or anything from adding either the true duals, or the Flowmaster system.
Hope this helps!