Im planning on installing an entire exhaust system on my LG4. Now Ive read that the hooker 2055 headers are highly recomended. My only question is, I live in illinois and therefore have emissions test. This these headers be ok, or do i need to look into a different brand. Also what are some other good cats catbacks and mufflers that are emissions safe but not restrictive.

What im looking for is to have the exhaust 3 in, the whole way through.. Im also looking for performance gains. For sound, I dont want the new system to wake up the neghborhood, but i do want it to lay down a deep below at WOT. Any help would be great, thank you

 

The 2055s are emissions legal, but you'll have to fix the problem of the driver's side A.I.R. tube facing the wrong way. I know some people have used brass elbows and some piping to fix this problem. I personally had my friend cut the air tubes off and weld them shut because I don't have emissions testing in my state.

As far as catbacks go, you have a lot of options here. You'll want a full 3" catback all the way from the catalytic convertor to the muffler, but there are plenty of companies to choose from that make a setup like this. Flowmaster, Hooker, SLP, Dynomax, Magnaflow, Banks, and Edelbrock are just some of the companies to choose from. I'm personally an anti-Flowmaster guy because that's all everyone around here seems to have, so I went with a Hooker SuperComp catback.

Good luck, hope this helps a bit.

 

Technically, the 2055's are only legal on '86-'90 TPI single cat applications. However, here in Colorado where they do a full under-hood inspection and dyno sniffer, they didn't seem to care enough to look up the application for the headers. From what I hear, they are more strict here in Colorado than they are by the pond in the Land of Lincoln.

As for the sniffer, if you have the A.I.R. hooked up and a good cat (such as the Catco 9118), and the engine is in good tune and condition, you won't have any problems there.

 

Cool, thanks for the tips. Am i better off buying a system all together by one company, or mixing and matching the rest of the exhaust?

 

If they are direct replacement parts, it doesn't matter as long as you get everything for the same application. The 2055's and 9118 are direct replacements for '86-'90 TPI single cat application, so as long as your cat-back is for the same, it will all bolt together and work just fine.

 

Ok after reasearching a little bit this is what ive decided...

Headers.... Hooker 2055 HOK-2055-1HKR
Cat.... CATCO CTO-9118
Catback.... American Thunder FLO-17233

The item numbers are from summit. Would this all fit together correctly? Also on summit it said that these are for 86-92 camaros, but i remember seeing that it doesnt matter, is that true for my case?

 

The american thunder cat-back sounds nice to some, but just remember that you're sacrificing maybe 3 or so rwhp (like it matters) by going with a flowmaster and that it's really rather quiet compared to other catbacks.

The hookers and that cat are good choices

 

Cool, thats kind of what im looking for, I dont want a supper loud system, just one thats a little louder than stock, but is alot less restricitive obviously.

 

Ive been debating on the american thunder cat back the hooker catback. ... HOK-16820HKR Is one noticably better, performance wise? Also how do they stack up side by side with their volume?

 

Just curious on how you planned on getting from the headers to the cat. Are you getting a custom Y-pipe made?

 

never mind, I assume they come with a Y-pipe like the HOK-2055HKR does. They just don't show it in the picture. I think.

 

Yea it says y pipe included on summit

 

BUMP

 

I'll let you know how the Hooker setup sounds once I get it on my car. I'm currently waiting for Jet-Hot to send me my headers back.

My car has a stock 85 LG4.

 

cool, thanks

 

Question, I was looking at Hookers website. I saw that for the HOK-16820HKR cat back that its for the non H.O. engines. They got the HOK-16822HKR for the H.O. engines. Would the one for HO engines be better for performance, and there wouldnt be any issues installing the HO catback on a non HO engine would there?

 

You don't want either with the CTO-9118. You want HOK-16823HKR.

There aren't any issues putting the "HO" exhaust on a non-HO engine, however there are issues trying to attach incompatible parts. The '83-'85 HO system has a different connection to the cat than the '86-'90 TPI single cat systems do.

 

Ah, ok thanks very much

 

Would I be able to buy that catback and cat and hook it up to my stock y-pipe until i save up some money for 2055's or would the 3" input on the cat not match up with the stock y-pipe?

 

It wouldn't match up. But, you could have a 2-1/4-3" adapter fabricated to mate the y-pipe to the cat. Don't modify the cat, though, just the old y-pipe.

 

My system consists of ceramic coated 2055s, for the drivers side a brass tube was put in the rubber hose, then another rubber hose attached to it to make the 180 degree bend.

I bought a Y-pipe to match, a three inch summit cutout, a cheap 3 inch catco cat, and a Hooker Catback. I really like the look of the exhaust tips, but I hate how much the mufflers for these cars weigh.

 

hows that exhaust sound on your lg4? notice performance gains?

 

It sounds nice. It would sound better without the peanut cam, but I like it. With the cutout open, it sounds mean.

I don't have any before numbers for the track, but I can only imagined it helped a ton. Log manifolds to headers, tiny bent y-pipe to a 3 inchmandrel bend, a clogged cat to a 3 inch in/out, you get the idea.

 

I finally got the headers on. It sounds good, but it's a little raspy and extremely loud. All I have on now is the 2055s and the y-pipe. However, it does sound a lot better than it did with the stock exhaust.

My friend is going to weld up the rest of the system on Saturday. I'll report back when it gets done.