Debating about adding high flow cat

N1 is too big? I thought it was like a 75mm exhaust? Mines not 4 inch it's a 3 but slightly bigger I believe like 3+. And no 130 just for a high flow catalytic converter not the exhaust. And yeah I just signed up on ebay, can anyone link me by pm to what they believe is worth getting? I have no experience using ebay so tips are welcomed please.

Also I'm not looking for NA performance mainly but if it helps as I am now cool, I'm looking into eventually swapping motors so building up my exhaust is a now or never thing. So if I stick a high cat with my exhaust will I really lose back pressure? And how much weight would I be saving roughly estimating?

So with my current Apex N1 and a possible high flow cat would it benefit me or will my NA be losing power? I'm also getting intake for free from a buddy so will all three help me or am I just losing out in power?

and I love my toyota that sucks, and wtf is it illegal to have a lowered car? I can imagine because brakes cannot be seen but wtf Supra's are already low, and if you ever did mod your engine would you keep it stock looking? Would a cop be able to identify parts even if it looked stock? And thats funny if he just wanted to check your car out. Was he being an asshole about it?

Oh lol just the cat. I was gonna say I got ripped! So the N1 is 75mm? I didn't know that. I thought it was larger like 90 to 95mm. Thats not too bad even if you were to put a turbo, it would be great. Honestly, I gained a good amount of power, but If you want full potential, you need to add more mods to ur car for ur exhaust to take full effect, ya know? I'd say I gained a good what...maybe 15 or 20 pounds. Stock exhaust compared to my HKS is a big difference and it helped. Felt like my Supra was quicker. Its noticeable. But yea my opinion...get the exhaust. The N1 has a good sound to it too, although i prefer my HKS sound. And yea that cop was a dick lol. He was cool and everything but just wasted my time. He didn't say lowering ur car is illegal but he did say any mod to ur car is illegal which I thought was complete bull. He either has NEVER seen a Supra or he loved it lol. And he wouldn't know if I had new cam shafts lol. Just a cold air intake which I don't have. Most cops around here are pretty cool though. But anyways, catback and intake....you'll be getting power. Even with just the exhaust. I think it's worth it

1) I noticed some backpressure from the hi-flow cat

2) Damn search function....but i read a thread somewhere in the MKIV sub-forum about a person who had 730rwhp and lost 30rwhp after installing the hi-flow cat and was tuning with an aem ems

3) here's a thread about jdm hi-flow cats http://www.supraforums.com/forum/showthread.php?t=300153

4) Not sure if this is still true in California, but a long time ago, they were pulling over lowered cars defined with license plates being below the 18" height. Probably not used anymore though as a lot of sports cars these days look/are lowered from the factory. I guess I worry more about scraping speedbumps, curbs, and hills

5) Sure, people have their "methods" but it's technically Only legal if it's CARB approved (i'm 90% sure of that...i think? heh).

6) regardless, if they want to, they can get you for anything. They don't even have to care if you have a cat or not. Even if it's a stock car, they can point to and question any part. They can simply send you to a ref if there's any doubt or reason -- legit or not. This has been done. In fact, I'm sure there are tons of other stories out there as well.

7) weld

8) Conclusion is that the hi-flow cat doesn't restrict too much. It will not appease cops but may help in general especially if CARB certified. It helps with making the car Not sound like a straight-piped / race-prepped / ....

9) i highly recommend going 2jzgte swap over na-t unless there are huge advantages to your 'methods' that counteract the fact that you're in california heh It is not uncommon that it only takes one cop in a bad mood..

10) yep, cali sucks for this unless $$$. Maybe it's true for the entire nation that 350-400hp+ cars are being pumped out And advertised that way to anyone with $$$ but they are seen flooring it around and weaving way more (from my experiences) while they pull over stereotyped import cars for stupid sht

Thanks man very informative explantions.

Reponses:

1) Backpressure is good or bad? Or is it too much is bad, a little is good?

2) Is it likely I will lose power? I've had numerous people tell me it's good if I get one but just want to make sure.

3) I'll read up, thanks

4) I do not plan to lower my car much, my car currently sags at the rear and the front is high due to worn out suspension, so I'm switiching my 114k mile suspension to stock TT suspension with about 45,000 miles, got it from an old forum member who no longer his Supra and was here about 5 years ago.

5) I'll have to ask the guy I got suspension from if it's carb legal although I doubt it. If not where can I get a carb legal one? And are there any carb legal performance parts for the Supra at all? And yeah I know the methods but it's a pain to find someone who will help me in my methods. If you know PM me please thedarcsage.

6) And yeah I'm worried about that, but since I already bought my car modded a bit I'll just BS if I can't find a way to remove my exhaust and other pieces.

7) Alright, how much does that usually cost?

8) I def. don't want to sound like a full straight pipe, my cousin has a 240sx with a home built exhaust and it's straight pipe. Stupid thing spurts out flames and is way way way too loud. So adding this will be a bit louder but will it be a lot louder than my current totally stock car with just n1 exhaust? Will it be rumbling loud?

9) And with the 2jz swap would I be okay going with aristo? And seeing as how you and I are in cali is it legal for me to swap with a Japanese motor? If I were to convert all the things like sensors and ecu could I somehow register it? Or is it possible to get it bar exempt all together? You know I really wish Cali would offer an option of us paying like 2k in fee's just to run a modded car and without having to worry about parts and etc.

10) I don't fully understand, do you mean there a lot of new 350-400+ HP cars running around doing more dumb crap than imports that look fast that get pulled over for being an import?

I have so many questions if anyone would like to help me out in planning out my car please IM me or PM me.

My aim is: lil pinoy bopper

Thanks all for the help so far!