I think I figured out the confusion. The OP posted "Civic Si" but I think he meant to say "Civic X".
Either way, the OP has a 1.8 engine that produces 141 hp. 300 horsepower isn't happening without adding a turbo and spending like 10K for parts and labor to upgrade things. Then of course...
My experience is that drop-ins offer a slight bump in throttle response and slightly more sound at WOT. Very minor increases though.
The best thing about them is the fact they are reusable. I've used K&N and the dry aFe and AEM filters. I prefer the dry type to the oiled K&N, but that's just me.
I've told this story before but I'm an oldtimer so forgive me for repeating myself.
Back in the early 80's I bought my first new Honda... a CRX. My previous cars were automatics but I really wanted this CRX bad. Anyway I drove my Trans Am (yeah I traded a Trans Am for a CRX) to the dealer to...
Honestly, the Si isn't the vehicle to push 300+ hp without beefing up the internals.
The 237whp / 281tq TSP Stage 1 tune may not sound like huge numbers, but remember, this is a 2900 lb. car. Combine that power with some small suspension improvements and you have a helluva well rounded ride.
It's funny how everyone is programmed these days that bigger is better or sportier. Truth is, a lightweight 17 with quality tires will offer better acceleration, braking and ride quality compared to a heavier 18. Cheaper too. On the other hand, 18's definitely look cooler.
Hate to be another one of those guys.
A tune is the best power mod. By far.
You can do basics like intakes and exhaust and most of your money will go into sound, not real performance gains. Plus, a tune will give you more than just extra power. It will give you better everyday...
It's all about moderation. If you're looking for a nice little uptick in performance, a base tune is a great way to do it in a relatively safe way. I say relatively because nothing is 100% risk free. My personal opinion is that the improvements in driveability are worth the risk.
One thing to keep in mind. The camo and especially the padding they're using in certain areas can give the illusion of a different shape than what's underneath. Don't assume it's quite as bulbous and blocky as it appears.
As far as the interior, I personally hate the stuck on tablet look.
I'll tell what. I've literally written thousands of posts on tuning. Here's a few to get you started:
That Injen CAI with it's serious fuel trim issues is a HUGE red flag especially for someone trying to eek out near max power. E85 is another red flag.
You have a lot of reading to do. :cool:
And yes, numerous 1.5T's (Si included) have blown due to excessive power levels.
Keep those surveys coming. A big thank you to everyone who has contributed a tuning survey so far. :thumbsup:
TUNED CIVIC X RELIABILITY SURVEY STATS
* Updated today
Total tuned participants: 246
Total tuned miles driven: 3,476,500 (estimated)
Most tuned miles: choo's '17 Sport Hatch (81,000+)...