zag300zx Posted January 21, 2009 Share Posted January 21, 2009 Hey guys, I just picked up an 07 LGT (peteh82's) and love it for the most part. The shifter is waaay too tall (ordered kartboy STS!) and the low end power is unimpressive. I am interested in doing an uppipe and downpipe install with an AP. But my fear is that the turbo noise will become too intrusive. I love how the car is so quiet and would hate to have to listen to the turbo whine and whistle all the time just accelerating through town like my old wrx. So what is the best option as to keeping the turbo noise in check? I assume it has to do with the wall thickness of the pipe. Will a stock STI uppipe fit? Is Cobb the thickest downpipe? Please Help! Link to comment Share on other sites More sharing options...
Giveup Posted January 21, 2009 Share Posted January 21, 2009 FWIW I just went stage 2 on my 08 over the weekend. I'm running the stock up (08s are catless) and used an Invidia DP and Perrin mid/y on stock cans. Intake is untouched. I can hear a slight turbo whine starting at 2500 rpm or so and if I nail it does give the ever pleaseant whoossshhh. However, that is all the the radio off. As soon as I turn on the radio or phone or whatnot I don't notice it anymore. I can't imagine it being that annoying unless you never use the radio and need dead silence for some reason. It's not loud enough for my phone to pick it up. HTH Link to comment Share on other sites More sharing options...
scoobydoobie Posted January 21, 2009 Share Posted January 21, 2009 Your 07' UP is already catless, so no need to change that. If you just add a DP it shouldn't add much more noise. The cobb DP tapers to 2.5 at the flange to mate with the stock exhaust using the donut gasket. Link to comment Share on other sites More sharing options...
zag300zx Posted January 21, 2009 Author Share Posted January 21, 2009 Alright that is great news about the 07 being uppipe catless. Saves me a huge PITA. So it looks like I'll be going with the Cobb catted DB! Link to comment Share on other sites More sharing options...
Spec B Posted January 21, 2009 Share Posted January 21, 2009 If you really want to keep sounds level low, you could gut the stock DP..and get 90% of the power you would with an aftermarket piece. The sound will be stock level..obviously! I think all aftermarket DP's will give you more noise. I personally would choose a divorved WG design DP, like the invidia. Good luck! Link to comment Share on other sites More sharing options...
zag300zx Posted January 22, 2009 Author Share Posted January 22, 2009 Thanks for the help guys. Gutting the DP might be a good option for me, as an aftermarket DP might only get you a little more power up top. Midrange should be the same. There are two cats in the DP, right? Do most people just gut the first cat? Link to comment Share on other sites More sharing options...
executor485 Posted January 22, 2009 Share Posted January 22, 2009 Yes, most people just gut the first cat. It is the most restrictive, also if you gut both cats, you have a much greater likelyhood of the "smell", with just the first cat gutted I almost never get the "smell". If I pass you on the right, I'm flipping you off. Link to comment Share on other sites More sharing options...
Dawrah Posted January 22, 2009 Share Posted January 22, 2009 fwiw i just ordered the complete perrin downpipe set b/c i like the fact of staying 99% emissions legal and the full 3" piping for future plans of mid and y. depending on state laws, and/or how laid back your inspection station is, you may want to keep emissions in mind. Link to comment Share on other sites More sharing options...
peteyjr Posted January 23, 2009 Share Posted January 23, 2009 I have Cobb catted on my WRX and Invidia catted on my LGT. Both give excellent power and are thick and quelch turbo noise 95%. Personally I prefer the divorced watsegate design on the Invidia. Intakes and CBE make the most noise. Link to comment Share on other sites More sharing options...
johnAWD Posted January 23, 2009 Share Posted January 23, 2009 If you leave the stock air intake in place, there will be no increase in turbo whine. With modified exhaust parts, you'll get more of that marvelous boxer rumble. Link to comment Share on other sites More sharing options...
Regal05LGT Posted January 23, 2009 Share Posted January 23, 2009 Gut the stock pipe, no money required, and it is extremely easy. Did mine said and done in a half hour or so Link to comment Share on other sites More sharing options...
korpsepatrol Posted January 23, 2009 Share Posted January 23, 2009 http://www.lolcats.com/view/1002/Gut the stock pipe, no money required, and it is extremely easy. Did mine said and done in a half hour or so no one believes you, prove it! 2008 6mt Legacy Gt Spec B DGM - Not so Stock/Work in progress 2006 5mt Legacy Gt OBP - Sold 2005 5eat Legacy Gt OBP - RIP R.I.P Coxx Link to comment Share on other sites More sharing options...
Regal05LGT Posted January 23, 2009 Share Posted January 23, 2009 Lol nice Link to comment Share on other sites More sharing options...
zag300zx Posted January 23, 2009 Author Share Posted January 23, 2009 Right now I am finding it hard to justify spending the extra $550 for a catted DP, except for the added bling factor and me knowing I got a sweet pipe under the car. But since money does not grow on trees, a gutted stock should work ok. Link to comment Share on other sites More sharing options...
Regal05LGT Posted January 23, 2009 Share Posted January 23, 2009 Where do you live??? Don't forget about emissions... I live in NY so it's only a visual inspection, it looks like I have cats so no issues passing Link to comment Share on other sites More sharing options...
rtbrjason Posted January 23, 2009 Share Posted January 23, 2009 I'm debating just gutting my first cat in the stock downpipe as well. Did those of you that did get new gaskets to reinstall it? Car has ~10k miles or so. Link to comment Share on other sites More sharing options...
executor485 Posted January 23, 2009 Share Posted January 23, 2009 If you just put the gasket seal stuff on it, they should be fine. Its just a spray and I havent noticed any exhaust leaks when I did mine like that. If I pass you on the right, I'm flipping you off. Link to comment Share on other sites More sharing options...
Regal05LGT Posted January 23, 2009 Share Posted January 23, 2009 The DP gaskets aren't as crucial as the UP ones..... It's only $20 or so for the piece of mind knowing you got a good exhaust seal Link to comment Share on other sites More sharing options...
zag300zx Posted January 24, 2009 Author Share Posted January 24, 2009 Where do you live??? Don't forget about emissions... I live in NY so it's only a visual inspection, it looks like I have cats so no issues passing Luckily I live in one of the few places that doesn't have any sort of emissions testing! Does anybody know the torque specs on the turbo bolts? Link to comment Share on other sites More sharing options...
Regal05LGT Posted January 24, 2009 Share Posted January 24, 2009 That's good for you lol, I'd say just gut that pipe! Idk exact torque specs, I just tightened as much as I could by hand.... Link to comment Share on other sites More sharing options...
Dawrah Posted January 24, 2009 Share Posted January 24, 2009 i bought new gaskets for peace of mind; i have 70k miles though. as for torque specs, im pretty sure the turbo to downpipe bolts/nuts are around 25 ft-lbs...kinda low but i'm pretty sure thats what the manual says....im taking this from memory so dont quote me Link to comment Share on other sites More sharing options...
Dawrah Posted February 8, 2009 Share Posted February 8, 2009 well here it is, perrin two piece catted downpipe along with other mods, and stock cbe. hopes this helps a bit [ame=http://www.youtube.com/watch?v=TbcuSMJgGXM]YouTube- 2005 Legacy GT headers and other parts[/ame] more info on the car http://legacygt.com/forums/showthread.php?t=105551 Link to comment Share on other sites More sharing options...
itsme Posted February 8, 2009 Share Posted February 8, 2009 why not get a shorty DP? You will keep you stock second catt and keep the noise down. Racer X FMIC for '05-'09 LGTs, '08+ WRX and '10+ LGT,'14+ FXT, and '15+ WRX TMIC Racerxengineering.com Link to comment Share on other sites More sharing options...
Dawrah Posted February 8, 2009 Share Posted February 8, 2009 i like the new noise, not that harsh but still contains a mean rumble when you want it Link to comment Share on other sites More sharing options...
imboden Posted February 8, 2009 Share Posted February 8, 2009 If you go to a local exhaust shop they can custom make you a quality catted downpipe to whichever size for much less, even including installation, than you would buy from our usual brands. Also a local warranty and guaranteed no leaks. Not sure why more people don't do this. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.