Exhaust for our cars- Thermal R&D vs. GReddy SP
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From: NY
Exhaust for our cars- Thermal R&D vs. GReddy SP
Just want to know which you think is better for an NA ef civic or crx with basic mods, Thermal R&D(2.25") or GReddy SP. The first thing I'd like to know is the difference in sound, both pitch and volume. What about quality, which will last longer or are they pretty much the same? And also the performance... I know the greddy sp has a chambered muffler that restricts airflow, but what about the thermal? I heard that they use magnaflow mufflers, is that true? If you know anything about them, please let me know what you think.
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From: Monroeville, PA, USA
Re: Exhaust for our cars- Thermal R&D vs. GReddy SP (OldSchoolHatch)
I am biased--Thermal on both the Civic and Prelude. 100% stainless steel and they both sound great. Soon to come for the CRX as well.
Joined: Jan 2002
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From: Clueless like Shaggy n Scooby before commercial, break
Re: Exhaust for our cars- Thermal R&D vs. GReddy SP (jc836)
My Thermal sounds even better than I had hoped for. Quiet at low rev's, loud at WOT! It's got a deep tone, also, which i like very much!
Looks awesome too!
Looks awesome too!
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From: Md
Re: Exhaust for our cars- Thermal R&D vs. GReddy SP (OldSchoolHatch)
a friend that i work with everyday has a 91 hatch, B16 and greddy. He has had 1 greddy kit go bad because the muffler cracked. I have the thermal on my 89 hatch w/ ZC. His car is SUPER quiet. You cant even tell it has much of an exhaust. My car is very quiet until about 4700 rpms... then it gets louder, but not rice loud just noticeable tone. Its very deep.
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From: NY
Re: Exhaust for our cars- Thermal R&D vs. GReddy SP (EFsleeper)
Thanks, but is it going to sound the same way with a stock 1.5L engine?
Does anyone know how they compare performance-wise? Are both of the mufflers chambered, and does thermal use magnaflow mufflers or not?
Does anyone know how they compare performance-wise? Are both of the mufflers chambered, and does thermal use magnaflow mufflers or not?
Honda-Tech Member
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From: San Jose/ Monterey, ca, usa
Re: Exhaust for our cars- Thermal R&D vs. GReddy SP (Crxer)
Basically all catbacks (same sizes) will offer the same hp outputs. You just have to look at quality, looks, and sound. Ryan
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From: austin, TX, USA
Re: Exhaust for our cars- Thermal R&D vs. GReddy SP (OldSchoolHatch)
Friend of mine living down South in Houston with unsalted roads had his Greddy SP rust out and actually fall off. I love the way the SP looks but I had to go with the stainless Thermal, very very happy customer.
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Re: Exhaust for our cars- Thermal R&D vs. GReddy SP (OldSchoolHatch)
Yeah but if the mufflers are designed differently it can affect the performance, right?
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From: TX, USA
Re: Exhaust for our cars- Thermal R&D vs. GReddy SP (OldSchoolHatch)
I have the apex'i ws, it's a nice solid peice, easy install, pretty quiet until you get on it, and then it screams, but I also have a header & intake so that makes it louderas well. I've had some ratteling issues that I need to track down, but I'd recomend this exhaust if you don't want it too loud, or if you want something w/ less than a 4" tip. oevrall 
from me
from me
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From: Fuck Thieves,, FL, usa
Re: Exhaust for our cars- Thermal R&D vs. GReddy SP (incubus)
I'm sorry man, but IMO, there is nothing that sounds sweeter than an APEX-i N1 exhaust when VTEC kicks in. It's ****** orgasmic 
I'd say the second would have to be the Thermal Stealth exhaust. NICE...
[Modified by Hybrid Invasion, 1:44 PM 2/24/2003]
I'd say the second would have to be the Thermal Stealth exhaust. NICE...[Modified by Hybrid Invasion, 1:44 PM 2/24/2003]
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From: NY
Re: Exhaust for our cars- Thermal R&D vs. GReddy SP (Ham'ed Hatch)
Yeah but if the mufflers are designed differently it can affect the performance, right?
yeah but you're talking about a 6hp gain max with exhaust. so if you ask me, i agree with the guy above, just pic one for looks and sound. a friend had a thermal a while back on his sohc 1.6, and it was prolly the nicest exhaust i've seen and heard. nice quiet tone and looked awesome.
yeah but you're talking about a 6hp gain max with exhaust. so if you ask me, i agree with the guy above, just pic one for looks and sound. a friend had a thermal a while back on his sohc 1.6, and it was prolly the nicest exhaust i've seen and heard. nice quiet tone and looked awesome.
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From: Hell, frozen over. USA
Re: Exhaust for our cars- Thermal R&D vs. GReddy SP (OldSchoolHatch)
From what I hear, both the Thermal and Greddy have a similar muffler design/style - straight through . "Anything less would be uncivilized."
I know the Thermal has a 2.25" piping diameter, I'm not sure about the Greddy though... I'm sure there aren't any performance differences between these two models, but I've heard nothing but good things about the quality/sound of the Thermal.
IMHO, go with the Thermal. It will give you results.
I know the Thermal has a 2.25" piping diameter, I'm not sure about the Greddy though... I'm sure there aren't any performance differences between these two models, but I've heard nothing but good things about the quality/sound of the Thermal.
IMHO, go with the Thermal. It will give you results.