hjkim12 Posted February 15, 2005 Share Posted February 15, 2005 If i was going to spend any money on the exhaust i would have prefered to get 3"s all the way through, so the cat back was a logical choice. Though on hindsite, I could have just replaced that straight portion before the Y to 3"s, since the volume of exhaust the 2 pipes after the Y increases so much...hmm..sright.. Link to comment Share on other sites More sharing options...
Xenonk Posted February 15, 2005 Share Posted February 15, 2005 Why do you need stickier tires? Does the Legacy have trouble hooking up at the drag strip? RE92s and an open diff in the front doesnt help much. The car makes enough power as it is, just need LARGER tires to make use of the max speed per gear so that you dont have to do as much shifting.. you might just pull off a 1/4 mile run with just 3 gears instead of 4.. think of the timing savings from just that alone. Keefe Keefe Link to comment Share on other sites More sharing options...
hjkim12 Posted February 15, 2005 Share Posted February 15, 2005 Given an opportunity, I think I would rather put some 15s or 14s on with some drag radials for the better launch..heh Link to comment Share on other sites More sharing options...
Xenonk Posted February 15, 2005 Share Posted February 15, 2005 Stock RE-92's are not great. STi's come with a pretty good tire. Getting stickier tires will make you a little quicker...hell...you can spin them in the 1-2 shift. And dropping the tire pressures help absorb some of the forces to allow better hook up (old drag technique that still haunts us all today). Keefe Keefe Link to comment Share on other sites More sharing options...
Xenonk Posted February 15, 2005 Share Posted February 15, 2005 Given an opportunity, I think I would rather put some 15s or 14s on with some drag radials for the better launch..heh sure, you can run 15s, just use Impreza RS OEM brakes and you are set. Just make sure you use a tire diameter of 25.3" or larger As for the exhuast, why not just run a 4" downpipe and just dump it from there? That's an easier way to make 4" 'exhaust' Keefe Keefe Link to comment Share on other sites More sharing options...
hjkim12 Posted February 15, 2005 Share Posted February 15, 2005 sure, you can run 15s, just use Impreza RS OEM brakes and you are set. Just make sure you use a tire diameter of 25.3" or larger As for the exhuast, why not just run a 4" downpipe and just dump it from there? That's an easier way to make 4" 'exhaust' Keefe I think 4" would be overkill..hahahhaah I would figure that the exhaust gases would have cooled enough where the extra diameter of the 3" tube in the back....but then i could be talking out of my ass..hahah Regardless, i just want to get that cat back installed so i don't have to hear that exhaust leak whenever I gas it..heh Link to comment Share on other sites More sharing options...
Daft Posted February 15, 2005 Share Posted February 15, 2005 Honestly, turbo cars run quite well with just a downpipe. I've done it a few times. It's good for a tenth or two on your E/T. The key with any turbo-back or cat-back system is that you try to maintain a constant size or stay with an increasing size to maximize the velocity of exhaust gasses all the way out of the tailpipe. Maintaining one size is still better because your exhaust gas velocity is at it's maximum all the way out. The turbine pushes the gasses for you but, if your pipe diameter drops back down in size at any point, you're causing a bottle neck and thus killing the velocity. Link to comment Share on other sites More sharing options...
John M Posted February 15, 2005 Share Posted February 15, 2005 A K&N drop-in and MBC at 15 psi was all I needed for the 13.98 (video at http://moojohn.com/subaru ) Now that I'm at 17 psi, and when I finally install the up pipe, it should be quite an improvement. Total spent so far: less than $200, including the up pipe. Link to comment Share on other sites More sharing options...
Xenonk Posted February 15, 2005 Share Posted February 15, 2005 I think 4" would be overkill..hahahhaah I would figure that the exhaust gases would have cooled enough where the extra diameter of the 3" tube in the back....but then i could be talking out of my ass..hahah Regardless, i just want to get that cat back installed so i don't have to hear that exhaust leak whenever I gas it..heh It's not an exhuast leak if the downpipe is the final pipe of the exhuast system Keefe Link to comment Share on other sites More sharing options...
hjkim12 Posted February 15, 2005 Share Posted February 15, 2005 very true..heh... Lame thing is the smell is leaking into the cabin..booo Link to comment Share on other sites More sharing options...
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