Going Bolt-on - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 14 (permalink) Old 07-01-2013, 11:23 AM Thread Starter
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So seeing as to how my exhaust is now holding by a thread, I've decided that it's a pretty good time to upgrade. That means tip to tail, header to.. tail, I suppose. Now, that being said, and with the risk of repeating this question for the 100th time, what is the best complete (and compatible) exhaust system that one could buy for the L61? This will be a simple bolt-on, so no shaving, shimmying, splicing, quantum tunneling or particle accelerating. Obviously, the car will remain N/A. I've honestly looked into going FI, but the costs of something like that is just too rich for my blood. I'm talking about a full on diabetic coma.

Now, I would prefer linear power to come in from mid RPM to redline, rather than breathe through a straw until I get kicked in the back of the head at 5,000RPM. Also, I want it to sound deep and throaty under throttle, but quiet and stock-like at idle, so I guess I'd need some magic resonator or something. Will that cut away from peak power? I hear Borla makes a good sounding cat-back.

Based on my research, 2.25 inch piping would be optimal, as would stainless steel and mandrel bent tubing be. I can never remember the difference between a 4-2-1 and a 4-1 header, but as I explained above, I'd prefer the more linear of the two, even at a slight cost of some ponies. I haven't a clue what makes a good downpipe a good downpipe. Having a freer flowing cat is good, would I need to change the O2 sensors? A superior cat-back system with a resonator and maybe a neat exhaust tip if the option is there. So, I apologize for being all over the place, I'm rather sleep deprived due to insane work hours so I'm a little bit everywhere. I would very much appreciate your opinions and comments, even about where and how to tune the car post installation. I've researched a few places around my area and this place got the most referrals: KNS AUTOSPORT Looks like they deal mostly with Japanese cars but I guess I'll have to give them a call. Heck, what do I even tell them? Tune my car please? I dunno. Anyways, looking forward to hearing your feedback. Peace.

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post #2 of 14 (permalink) Old 07-01-2013, 11:28 AM
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ZZP midlength header and downpipe with a highflow cat will be your best option for a middle of the road performance gain. Not too much at the low and not too much at the high. As for the cat back you will get a million different answers. Start looking on youtube for different systems and keep in mind the mods those people have because it will change.


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post #3 of 14 (permalink) Old 07-01-2013, 11:39 AM
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The difference between the header is explained in question #16:

https://www.yourcobalt.com/forums/eng...ormance-q.html

Quote:
16. Q;What is the difference between a 4-1 and 4-2-1 header?

A. Well honestly the flow is the difference, as well as how the pipes are collected. A 4-1 header actually flows a lot better than a 4-2-1 header, thus offering better top end power for boosted applications, and high HP applications. The 4-2-1 header takes the 4 cylinders, and collects cylinders 1-2 together, and 3-4 together, and a little further down it collects the two sides together. What this does is cause a little bit of turbulance in the exhaust system giving a little bit of back pressure. This allows for better low end torque, but less flow top end so you will sacrafice a little bit of HP by using it, but you will have better pulling power down low.

'09 SS/TC - Stolen
Mods - Injen CAI, CIA MAF Relocate CP's, Dejon FMIC,
Custom 3" DP, 3" Exhaust, GT3076R, Pioneer AVH-4100DVD, Hurst STS, ZZP triple pod, Autometer Cobalt boost/DPIC/WB gauges, Nitto NT05 245/40/18's, H&R Springs, 80:20 Meth Spray
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Mods - *Updated 10/6/13* AEM TRUboost EBC, 4in custom TBE, SD dual 93/e85 tune, ETS 4in Race Core FMIC, Dual Aeromotive 400lph Fuel Pumps, T4 Tubular Manifold w/ dual WG's, FP Super99HTZ DBB Turbo, GSC 274 mivec cams, ARP headstuds/rod studs, FIC 2150cc Injectors, Aeromotive FPR, Aeromotive Fuel Rail, catch can, Mini Battery Kit, Slim Coolant Fan, Kiggly Racing high pressure valve Springs/Titanium Retainers, Supertech Stainless Steel Valves, Dual VTA Tial 44mm WG's, 4g64 Stroker Manley Pistons, 155mm 2.4 LR Manley Turbo Plus I Beam Rods with ARP 625 Studs, 100mm forged non-billet Manley Crankshaft, Full H/E PNP with Port Matching, Kiggly Racing Girdle, Dual Tial 50mm BOV's, Excedy Triple Disc Carbon HD Clutch, AEM EMS

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Mods - 5in TBE, Boost Elbow set to 28psi, Adjusted fuel pump, Open Turbo.

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post #4 of 14 (permalink) Old 07-01-2013, 12:16 PM Thread Starter
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BB: So you're saying this is the way to go? ZZPerformance - Mid Length Header & Downpipe Combo #ZZ-MIDLHDP Cool, looking into it + cat-back options.

Levi: That's it. Thank you for clarifying.

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post #5 of 14 (permalink) Old 07-01-2013, 12:17 PM
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Yep np

'09 SS/TC - Stolen
Mods - Injen CAI, CIA MAF Relocate CP's, Dejon FMIC,
Custom 3" DP, 3" Exhaust, GT3076R, Pioneer AVH-4100DVD, Hurst STS, ZZP triple pod, Autometer Cobalt boost/DPIC/WB gauges, Nitto NT05 245/40/18's, H&R Springs, 80:20 Meth Spray
Future - KSport Kontrol Pro Coilovers, 10% Tint, FMIC spray
538whp/501wtq @38 psi on meth and 93 oct on stock ish motor


06 EVO IX MR/SE - Sold
Mods - *Updated 10/6/13* AEM TRUboost EBC, 4in custom TBE, SD dual 93/e85 tune, ETS 4in Race Core FMIC, Dual Aeromotive 400lph Fuel Pumps, T4 Tubular Manifold w/ dual WG's, FP Super99HTZ DBB Turbo, GSC 274 mivec cams, ARP headstuds/rod studs, FIC 2150cc Injectors, Aeromotive FPR, Aeromotive Fuel Rail, catch can, Mini Battery Kit, Slim Coolant Fan, Kiggly Racing high pressure valve Springs/Titanium Retainers, Supertech Stainless Steel Valves, Dual VTA Tial 44mm WG's, 4g64 Stroker Manley Pistons, 155mm 2.4 LR Manley Turbo Plus I Beam Rods with ARP 625 Studs, 100mm forged non-billet Manley Crankshaft, Full H/E PNP with Port Matching, Kiggly Racing Girdle, Dual Tial 50mm BOV's, Excedy Triple Disc Carbon HD Clutch, AEM EMS

'95 Ram 2500 Diesel
Mods - 5in TBE, Boost Elbow set to 28psi, Adjusted fuel pump, Open Turbo.

Future Mods- Super Street Clutch (rated @1400ftlbs tq), 67mm turbo, 160lb valve springs, added timing, tubular exhaust manifold, larger injectors, possible 6 spd swap.


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post #6 of 14 (permalink) Old 07-01-2013, 12:49 PM
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Yes, that will get you best of both worlds and they will refund you some if you send back your stock cat.


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post #7 of 14 (permalink) Old 07-09-2013, 11:41 PM
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Speed daddy 2.25 exhaust from eBay. I just got it. I love it. 135 bucks too!! T304 stainless steel, Mendel bend etc. def worth the money
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post #8 of 14 (permalink) Old 07-13-2013, 08:58 AM Thread Starter
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Alright, honed in on the ZZP midlength header & DP, but still going through the dozen or so cat-back options. Say for instance I am unable to decide on something, can I just go ahead and order the header/dp combo and install it on the stock cat-back? Will I notice any immediate gains in performance and sound? Will it be safe to run? Will it even bolt up? And what options do I need to take? 1.5'' or 1.75'' primaries? I believe the spun metal cat is a must, think I'll skip the extra wideband O2 bung, defiantly want the gaskets. Will it code? Anything else to consider?

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post #9 of 14 (permalink) Old 07-13-2013, 11:38 AM
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I would think a 1.5" primary would be sufficient for a 4 cyl considering my 5.0L mustang only had 1 5/8" and that's a mustang.

Been discussed on here before to just buy the gaskets from a local parts supplier because its cheaper than getting the zzp gaskets

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post #10 of 14 (permalink) Old 07-14-2013, 07:42 AM Thread Starter
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Right, so the gaskets would be the same as the stock ones? Nothing more to it.

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