hey i just bought my si used and all it came with is a greddy cat back and a aem SR. it sounds awesome. but the exhaust is very quiet. idk if the person had an extra resonator added to it or if its supposed to be that quiet. and my other question is it already has a aem SR intake. would it be worth selling it and getting a CAI or should i just keep the SR? doubt there is that much dif in hp if any at all. also i hear the throttle body spacers work well on this car. is that true?

 

It's your first day, welcome... but you need to learn to search the site. things like this have already been discussed in great depth.

 

CAI will give you very minimal gains over SRI. You can bank on maybe 1hp to 3hp. But then again, even a CAI/H/E setup will give you very minimal gains over a stock setup, compared to older engines with less complex ECUs

 

Oh really. Is that why I gained nearly 20whp on a Mustang dyno with just the Intake and Header portion added to my car??

 

Nice, is that with a reflash?

 

Do you have a dyno sheet of before and after the mods were installed? What intake and header did you upgrade to?

 

So what are you pushing now? 195hp, 200hp?

 

also ive heard mustang dynoes are crap and not very accurate. but thats just what i have heard. not calling you a lier. and yea i figured topics like this have already been discussed i was just looking for new opinions. plus for a new car its a lil harder to search for stuff when i not really familiar with the car. i def dont want header. had it on the last car and its just not really worth it. im prob gonna keep the short ram to save myself some money but idk we shall see. also like i was asking before anyone know anything about throttle body spacers?

 

x2

 

keep the sri if you want to do the tbs's. with the cai the tbs pushes the cai into the upper radiator hose.

 

Most usefull post in this thread,

Id also like to see proof Rico, before and after would be awesome K thanks

 

there are dozens of posts on 8thcivic with dynos that show 15-20 whp gains from good i/h/e combos

 

But I wanna see Rico's Dyno results, not somebody elses. Dyno's give such different results it would be dumb to compare two seperate dyno results. Yes im sure there was alot of post that show the same but were they Rico's? Besides, those could be on Dynojets, mustang dyno's etc.

I have no doubt there would be some showing those gains.

 

ok cool. ill keep the SRI and add the TBS. thanks guys. also living in louisiana with a lot of rain a short ram intake would prob be best. does anyone know how much hp a SRI or CAI gives the si to the wheels?

 

i remember reading a honda tuning a while back where they did basic bolt-ons to a rsx type-s and they dynoed after every bolt on. a cai was like 7 whp or something i think

 

a header is the best Bolt-on power mod you can do to the Si before going Forced induction.. it gives more power than Intake or exhaust...

 

It doesn't [freak]ing matter what dyno it was done on. If there is a before run(without mods) and an after run (with mods) and they were both run on the same dyno with the same/adjusted conditions, then they will still show an accurate jump in hp and torque, whether the final numbers show 225hp or 195hp. Bringing the brand of dyno in is pointless. Sure, one may show a higher peak, but that isn't the point.

 

I do have a dyno sheet...but I don't have a scanner to upload it to the computer. I created a thread a while back....some of you remember it. My results were 180whp on the dyno, but the Mustang Dyno factors between an 18 - 23% loss to the wheels on all their vehicles.

I didn't dyno my car before the mods because I didn't know about the place; however the owner called me up and said he had a stock FG2 roll into the shop about a few weeks after I had my car dynoed with the mods. The stock FG2 made 162whp.

To the gentleman who heard that Mustang dynos are "crap and not very accurate", they are actually one of the BEST dynos to tune off of because they simulate real life conditions and factor them into the results, hence the lower more REALISTIC output associated with a proper Mustang dynos.

I verified the claimed loss % from the shop by looking at some of their other dyno results from other vehicles they dynoed in stock form. All of them were in that bracket of 18 - 23%. I used the lowest number just to be generous and that yields 19whp over the stock FG2 that was AT THE EXACT SAME SHOP.

The exhaust system is one of the most restrictive components of our cars. Believe me an Intake and especially a race header WILL make a pretty big difference.

I know I don't have any hard proof to show you guys....but anybody who's anybody on here and knows me well enough knows that I have no reason to lie to any of you. So you can take it as it is and believe me or you can kiss my ***.....but that's the truth!

 

At the track, in my stock Si, I've pulled on SIs (with intake and header) from the line, but they pull very very hard on the top end.

I got your back homeslice!

 

One thing I've noticed with a SRI is that I lost a little low-end power. But what I lost down low I gained up top. And the race header helps with the midrange pickup as well. A few stock FG2s have pulled on me to off the line, but beyond first gear where the Si is constantly in the upper RPMs, it's just a steady walk-down....and walk-away.

 

extra resonator added to it or if its supposed to be that quiet
Most full greddy cat-back system will have a resonator. You may have the sp2 which is suppose to be quiet. I'll happily take it off your hands if you wish.

worth selling it and getting a CAI
Is a SRI worth selling for a CAI? Performance gain is marginal (unless you can feel a 2~3 hp difference) but I think a lot of people look at the big picture and factor in weather, ease of installation, power goals, etc. I've never had my car hydro-locked with a CAI but I find it easier to not even worry about it with a SRI. Installation is not hard but time consuming. I had to take off my bumper and cut a whole in my wheel fender to install my INJEN CAI. Also, some people want as much power as they can and opted for a CAI. It's up to you.

throttle body spacers work well
I would say so but it's still marginal. 8thcivic.com has a great thread with before and after dynocharts. Some argue that it's the best bang for the buck mod. Go check it out here. I have one on my car but I can't really tell much difference with my CAI. Pretty interesting because the thread also indicated that there was almost no improvement with a CAI if you had a TBS already.

Kris5597, look at the big picture if you're planning to make power. Don't look at one part adding X amount power but instead, look at all the pieces together as a system making power. An intake will only do so much but if you add a race-header (w/o cat or a high-flow cat) and a properly sized cat-back system, you'll see more improvement. That's why it's normal to see a basic breathing system (especially on a K-series) making 15~20hp versus an intake alone making ~5hp.

 

yea i see your point. and IMO the si is pretty fast enough even for a stock car and mine has a few mods and its still very quick. and no its def the Evo2 and yes i do know all catbacks come with one resonator i just figured it would be louder seeing as the factory resonator is bigger and this is aftermarket. but its cool. i like it. can hear it when i want and cant when i dont. dont think it could be any better than that. as for the SRI ill keep it. ill get a TBS to make up for the few hp lost from having a SRI than a CAI and pretty much be equal to having a CAI if not a lil more. i dont want to install a race header. i have gone through that before with rasp and i dont want to deal with it again. plus the si isnt one for low end so i would kinda like to keep as much as i can. also anyone put a NST lite crank pulley on their si yet? i had one on my tc and i loved it felt a difference. anyone here have one?

 

you should check to see if the silencer is installed on the exhaust. That might be why its so quiet. Cause I heard the greddy exhaust was supposed to be fairly loud.

 

if the silencer goes in the tip its not there. dont know of any other place it could be.

 

GET AN HONDATA REFLASH AND CALL IT A DAY!!!!